2026

Journals

Sorokina, E.S., Schmitt, A.K., Häger, T. & Hopp, J. (2026): High-spatial-resolution oxygen isotopic analysis to distinguish natural from synthetic corundum. Eur. J. Mineral., 38, 123–134. https://doi.org/10.5194/ejm-38-123-2026

2025

Conference contributions

Häger, T. (2025): Interaction of trace elements in corundum at high temperatures – a discussion. The 8^th International Gem & Jewelry Conference, Bangkok (GIT 2025); 82-83.

Journals

Artes, E., Ackermann, D, Duellmann, Ch. E., Haeger, T., Kindler, B., Lefrou, T., Lommel, B., Basto, A. T. L., Meyer, C. -C., Mokry, C., Munnik, F., Piot, J., Reed, L. E., Renisch, D., Rothard, H., Runke, J., Savajols, H., Stodel, C., Madi, T., Urbanova, V., Watt-Morel, V., Yakushev, A. (2025): Preparation of lanthanide thin films for ion beam experiments and post irradiation characterization. Nuclear instruments & methods in Physics Research section A – Accelerators, spectrometers, detectors and associated equipment, 1075, 1-11.

Artes, E., Cavallo, P., Häger, T., Meyer, C.-C., Mokry, C., Renisch, D., Runke, J., Schaffner, E., Seibert, A., Trautmann, C. and Düllmann, C.E. (2025): Influence of carbon dioxide and water concentration on terbium thin films produced by Molecular Plating. Radiochim. Acta 13(10): 779–789. DOI: 10.1515/ract-2025-0021

Hanser, CS, Schmitz, FD., Häger, T., Botcharnikov, (2025): Quantification of the Iron Content in Blue Beryl and Bluish Green Emerald Using Spectrum Resolution of UV-Vis-NIR Spectra. J. Gemmol. 39, 466- DOI: 10.15506/JoG.2025.39.5.466

Liu, W., Shi, G., Zhou, Z., Qin, L., Li, X., Quan, X., Yuan, Y., Häger, T., Jantschke, A. & Botcharnikov, R. (2025): High-temperature wood silicification: constraints from fluid and carbonaceous inclusions in quartz from Qitai, NW China. Scientific Reports | 15:42961 https://doi.org/10.1038/s41598-025-27072-z

2024

Journals

Frankhäuser, G.; Grimm, K.I. & Häger, T. (2024): Die Mainzer Reichskrone unter der Lupe. Mainzer naturwiss. Archiv, 61, 187-194.

Hanser, C. S.; Vullum, P. E; van Helvoort, A. T. J.; Schmitz, F.; Häger, T.; Botcharnikov, R. & Holst, B. (2024): Atomic resolution transmission electron microscopy visualisation of channel occupancy in beryl in different crystallographic directions. Physics and Chemistry of Minerals 51:24; 13 Seiten.

Hanser, C. S., Häger, T., and Botcharnikov, R. (2024): Incorporation and substitution of ions and H₂O in the structure of beryl, Eur. J. Mineral., 36, 449–472

2023

Journals

Hanser, C. S.; Gul, B.; Häger, T. & Botcharnikov, R. (2023): Comparison of Emeralds from the Chitral District, Pakistan, with other Pakistani and Afghan Emeralds. J. Gemmology, 38; 582-599.

Sorokina, E.S., Albertc, R., Botcharnikova, R.E. Popove, M.P., Häger, T., Hofmeister, W. & Gerdes, A. (2023): Origin of Uralian andradite (var. demantoid): Constraints from in situ U-Pb LA-ICP-MS dating and trace element analysis. Lithos; Volume 444-445.

2022

Conference contributions

Rojas-Agramonte, Y.; Häger, T.; Gerdes, A.; Gonzalez Pinzón, M.A.; Charris, F., Altenberger, U.; Villalobos Balser, J. D. & Gonzalez Arango, C. (2022): Dating Colombian emeralds: New in situ U-Pb age in carbonates (calcite). DAAD Newsletter No. 1 June 2022; 30-34.

Journals

Altenberger, U.; Rojas‐Agramonte, Y.; Yang, Y.; Fernández‐Lamus, J.; Häger, T.; Guenter, C.; Gonzalez‐Pinzón, A.; Charris‐Leal, F. & Artel, J. (2022): In Situ U–Th–Pb Dating of Parisite: Implication for the Age of Mineralization of Colombian Emeralds. Minerals 12, 1232; 1-16.

Hanser, C. S.; Gul, B.; Häger, T. & Botcharnikov, R. (2022): Beryl from the Chitral Region, Pakistan: A New Emerald Deposit. Zeitschrift der Deutschen Gemmologischen Gesellschaft, 71, 35-56.

Hanser, C. S.; Gul, B.; Häger, T. & Botcharnikov, R. (2022): Emerald from the Chitral Region, Pakistan: A New Deposit. J. Gemmology, 38; 234-252.

2021

Conference contributions

Sorokina, E., Botcharnikov, R., Kostitsyn, Y., Rösel, D., Häger, T., Rassomakhin, M., Kononkova, N., Somsikova, A., Berndt, J., Ludwig, T., Medvedeva, E., Hofmeister, W. (2021): Sapphire-bearing magmatic rocks as indicators of the continental collision tectonic events: a case study of Uralian orogenic belt EGU General Assembly Conference Abstracts, EGU21-9122.

Sorokina, E., Botcharnikov,k R., Kostitsyn, Yu., Rösel, D., Häger, T., Rassomakhin, M., Kononkova, N., Somsikova, A., Berndt, J., Ludwig, T., Medvedeva, E., Hofmeister, W. (2021): Two-stage development of corundum-blue sapphire syenite pegmatites from Ilmen mountains, south Urals. Proceedings of the 3rd EMC 2020 Krakow Poland, 362.

Sorokina E., Häger T., Ludwig Th., Botcharnikov R. (2021). Using oxygen isotopic composition as a proxy in separation natural vs. synthetic corundum material. Proceedings of the 3rd EMC 2020 Krakow Poland, 363.

Journals

Helmy, M.H., Botcharnikov, R., Ballhaus, C., Deutsch‑Zemlitskaya, A. Wirth, R., Schreiber, A., Buhre, S. & Häger, T. (2021): Evolution of magmatic sulfide liquids: how and when base metal sulfides crystallize? Contributions to Mineralogy and Petrology 107

Sorokina, E.S., Botcharnikov R.E., Kostitsyn, Y.A. Rösel, D., Häger, T., Rassomakhin, M.A., Kononkova, N.N., Somsikova, A.V., Berndt, J., Ludwig, T., Medvedeva, E.V. & Hofmeister, W. (2021): Sapphire-bearing magmatic rocks trace the boundary between paleo-continents: A casestudy of Ilmenogorsky alkaline complex, Uralian collision zone of Russia. Gondwana Research 92; 239-252.

Sugzdaite, A., Häger, T., Sorokina, E., Popov, M.P., Nikolaev, A., Botcharnikov, R. & Hofmeister, W. (2021): Investigations of natural and heat-treated demantoids from the Central Ural Mountains in Russia.- Zeitschrift der Deutschen Gemmologischen Gesellschaft 70/3/4, 19-36.

Books

Häger, T. & Wehrmeister, U. (2021): Gemstones – Identification, Properties, and Treatment, Springer Spektrum, Heidelberg, ISBN 978-3-662-61304-7 printed, ISBN 978-3-662-61305-4 for the e-book, online: https://link.springer.com/book/10.1007%2F978-3-662-61305-4

2020

Journals

Häger, T., Rojas-Agramonte, Y., Charris Leal, F., Villalobos Basler, J.D., Gonzales Pinzon, M.A. & Hauzenberger, Ch. (2020): Emeralds from Colombia. Z. Dt. Gemmol. Ges. 69, 47-57.

Sun, Y., Schmitt, A.K., Häger, T., Schneider, M., Pappalardo, L., M.R. (2020): Natural blue zircon from Vesuvius. Mineralogy and Petrology 115, 21–36.

LitvinenkoA.K., Sorokina, E.S., Häger, T., Kostitsyn, Y.A., Botcharnikov, R.B., Somsikova, A.V., Ludwig, T., Romashova, T.V., & Hofmeister, W. (2020): Petrogenesis of the Snezhnoe Ruby Deposit, Central Pamir. Minerals 10, 478

2019

Conference contributions

Häger, T., Rojas-Agramonte, Y., Charris Leal, F., Villalobos Basler, J.D., Gonzales Pinzon, M.A. & Hauzenberger, Ch. (2019): Colombian Emeralds – an update. Z. Dt. Gemmol. Ges. 68, 43-47.

Stephan, T. Häger, T., Henn, U. & Hofmeister, W. (2019): The role of V³⁺ in gemstones mainly coloured by Cr³⁺, shown by spectral fitting at the example of emerald and ruby. . Z. Dt. Gemmol. Ges. 68, 53-57.

Sorokina ES, Botcharnikov RE, Berndt J, Häger T & Hofmeister W. Sapphire-Bearing Rocks as Indicators of Continent-To-Continent Collision Events. Goldschmidt Abstracts, 2019 3173

Journals

Nicklich, N., Knipper, C., Nehlich, O., Held, P., Rossbach, A., Klein, S., Schwab, R., Häger, T. Wolf, M., Enzmann, F., Birkenhagen, B. & Alt, K.W. (2019): A Roman-Period dental filling made of hard tissue compound? Bioarchaeological and medical-historical investigations carried out on roman-period burial from Oberleuken-Perl (LKR. Merzig-Wardern / D) Archäologisches Korrespondenzblatt 49, 371-391.

2018

Conference contributions

Stephan, T. Häger, T., Henn, U. & Hofmeister, W. (2018): Quantitative determination of Cr³⁺and V³⁺ contents in Rubies by spectral fitting of UV-Vis-NIR Spectra. Gems & Gemology, Vol. 54, 345-346.

Journals

Häger, T. (2018): Heat Treatment of Corundum. Z. Dt. Gemmol. Ges. Vol. 67; 11-20.

Khoi, N.N., Hauzenberger, C.A., Sutthirat, C., Tuan, D.A., Häger, T. and Nam, N.V. (2018): Corundum with Spinel Corona from the Tan Huong–Truc Lau Area in Northern Vietnam. Gems & Gemology Vol. 54, 4; pp. 404-417.

2017

Journals

Le Thi Thu Huong, Haeger, T., The-Long Phan (2017): Study of impurity in blue spinel from the Luc Yen miningarea, Yen Bai province, Vietnam. Vietnam Journal of Earth Sciences, 40(1), 47-55.

Huong, L.T.T., Otter, L.M., Häger, T., Ullmann, T., Hofmeister, W. Weis, U. & Jochum, K.P. (2017): Characterization of yellow danburites from Luc Yen, Vietnam. Journal of the German Gemmological Society, 66, 31-50.

Otter, L.M. Agbaje, O.B.A., Le T.-T. H, Häger, T. and Jacob, D.E. (2017): Akoya cultured Pearl farming in eastern Australia. Gems & Gemology; Vol. 53, No. 4, pp. 423–437.

Monarumit, N., Wongkokua, W., Häger, T., Wathanakul, P., Satitkune, S. (2016): The Phase Transition of Corundum-Eskolaite Mineral Series Probed by X-Ray Absorption Spectroscopy. Applied Mechanics and Materials Vol. 865, 15-19

Sorokina, E., Rösel, D., Häger, T., Mertz-Kraus, R. & Saul, J. M. (2017): LA-ICP-MS U-Pb dating of rutile inclusions within corundum (ruby and sapphire): new constraints on the formation of corundum deposits along the Mozambique belt. Miner Deposita Phan, D.T.M., Häger, T. & Hofmeister, W. (2017): The influence of the Fe₂O₃ content on the Raman spectra of sapphires. Journal of Raman spectroscopy 48, 453-457.

2016

Conference contributions

Häger, T., Schmitz, F., Stephan, T., Müller, S.MSc. (2016): Strontium aluminate as an imitation for phosphorizing Apatite. 5^th GIT international Gem & Jewelry conference, Bangkok,.207-208.

Hauzenberger, C.A., Sutthirat, C., Nguyen, K.N., Haeger, T., Nantasin, P., Wathanakul, P. (2016): Ruby and Sapphire Deposits in Southeast-Asia. ASEA-Uninet plenary meeting Udayana University, in Denpasar, Bali

Wassenburg, J.A., Scholz, D., Jochum, K.P., Cheng, H., Oster, J., Immenhauser, A., Richter, D.K., Haeger, T., Hoffmann, D. and Breitenbach, S.F.M. (2016): Determination of aragonite trace element partition coefficients from speleothem calcite-aragonite transitions. Geophysical Research Abstracts; Vol. 18, EGU2016-15569

Journals

Huong, L.T.-T, Vuong, B.S., Thuyet, N.T.M., Khoi, N.N., Satitkune, S., Wanthanachaisaeng, B., Hofmeister, W., Häger, T. & Hauzenberger, C. (2016): Geology, Gemmological Properties and Preliminary Heat Treatment of Gem-Quality Zircon from the Central Highlands of Vietnam. The Journal of Gemmology, 35(4), 308-318.

Huong, L.T.-T., Nhung, N.T., Kien, N.D.T., Zubko, M., T. Häger, T., & Hofmeister, W. (2016): Structural Investigation of K-Feldspar KAlSi₃O₈ Crystals by XRD and Raman Spectroscopy: An Application to Petrological Study of Luc Yen Pegmatites, Yen Bai Province, Vietnam. Acta Physica Polonica A, Vol. 130, 892-893. Proceedings of the XXIII Conference on Applied Crystallography, Krynica Zdrój, Poland, September 20–24, 2015

Monarumit; N.; Wongkokua; W.; Häger, T.; Wathanakul, P. & Satitkune, S. (2016): The Phase Transition of Corundum-Eskolaite Mineral Series Probed by X-Ray Absorption Spectroscopy. Applied Mechanics and Materials; Vol. 865, pp 15-19.

Nasdala, L., Corfu, F., Valley, J.W., Spicuzza, M.J., Wu, F.-Y., Li, Q.-L., Yang, Y.-H., Fisher, C., Münker, C., Kennedy, A. K., Reiners P. W., Kronz A., Wiedenbeck, M., Wirth, R., Chanmuang, C., Zeug, M., Vaczi, T., Norberg, N., Häger, T., Kröner, A. & Hofmeister, W. (2016): Zircon M127 – A Homogeneous Reference Material for SIMS U–Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis. Geostandards and Geoanalytical Research 40, 457-475.

Nguyen, N.K., Hauzenberger, C.A.; Duong, A.T., Häger, T., Nguyen, V.N., Nguyen, T.D. (2016): Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam). Journal of Mineralogy and Geochemistry 193, 161-181.

Phan, D.T.M., Häger, T. & Hofmeister, W. (2016): The influence of the Fe₂O₃ content on the Raman spectra of sapphires. J. Raman Spectrosc. 48, 453–457.

Salomon, E.; Koehn, D., Passchier, C., Chung, P., Häger, T., Salvona, A., Davis, J. (2016): Deformation and fluid flow in the Huab Basin and Etendeka Plateau, NW Namibia. Journal of Structural Geology 88, 46-62.

Sorokina, E.S., Hofmeister, W., Häger, T., Mertz-Kraus, R., Buhre, S., Saul, J.M. (2016): Morphological and chemical evolution of corundum (ruby and sapphire): Crystal ontogeny reconstructed by EMPA, LA-ICP-MS, and Cr3+ Raman mapping. American Mineralogist, 101, i. 12, p. 2716-2722.

Thuyet; N. T. M., Hauzenberger, C., Khoi, N. N., Diep, C. T., Lam, C. V., Minh, N. T., Hoang, N. & Häger, T. (2016): Peridot from the central highlands of Vietnam: Properties, origin and formation. Gems & Gemology; Vol. 52, No. 3, pp. 276–287.

Wassenburg, J. A., Scholz, D., Jochum, K.P., Cheng, H., Oster, J., Immenhauser, A., Richter, D K., Häger, T., Jamieson, R.A., Baldini, J.U.L., Hoffmann, D., Breitenbach, S.F.M. (2016): Determination of aragonite trace element distribution coefficients from speleothem calcite–aragonite transitions. Geochimica et Cosmochimica Acta 190; 347–367

2015

Conference Contributions

Hauzenberger, Nguyen, Häger, Sutthirat, Wathankul, Le Thi-Thu Huong (2015): Genesis of ruby and sapphire deposits in Vietnam. Mitteilungen der Österreichischen Mineralogischen Gesellschaft 161, MinPet 2015, Leoben, Austria, September 10-13

Häger, T., Karlowski, P., Henn, U. & Schmitz, F. (2015): X-ray irradiation of watermelon Tourmaline from Rwands. Mitteilungen der Österreichischen Mineralogischen Gesellschaft 161, MinPet 2015, Leoben, Austria, September 10-13

Le Thi-Thu Huong, Nhung N.T., Zubko M., Häger T., Hofmeister W. (2015): Structural investigation of K-feldspar KAlSi₃O₈ crystals by XRD and Raman spectroscopy: An application to petrological study of Luc Yen pegmatite. Conference on Applied Crystallography, At Krynica Zdroj, Poland

Nasdala, L., Chanmuang, C., Häger, T., Hofmeister, W., Kennedy, A.K., Reiners, P.W., Vaczi, T., Valley, J.W., Wanthanachaisaeng, B., Wu, F., Zeug, M. & Zoysa, E.G. (2015): The scientific importance of gem zircon as analytical reference materials. 34th International Gemological Conference, Vilnius, Lithuania, August, 2015. Proceedings, pp. 128–131.

Journals

Gehl, A. ; Dietzsch, M.; Mondeshki, M.; Bach, S.; Häger, T., Panthöfer, M.; Barton, B.; Kolb, U.; Tremel, W. (2015): Anhydrous Amorphous Calcium Oxalate Nanoparticles from Ionic Liquids: Stable Crystallization Intermediates in the Formation of Whewellite. CHEMISTRY-A EUROPEAN JOURNAL; Vol. 21; Issue: 50; 18192-18201

Sorokina, E. S., Litvinenko, A.K., Hofmeister, W., Häger, T., Jacob, D., Nasriddino, Z.Z. (2015): Rubies and sapphires from Snezhnoe, Tajikistan. Gems & Gemology, Vol. 51; 160-175.

2014

Conference contributions

Buchen, J., Wesemann, V., Rytz, D., Häger, T., Buhre, S., & Hofmeister, W. (2014): UV-absorption centers and microstructure of YAl₃(BO₃)₄ single crystals. DeutscheKristallzüchtungstagung 12.-14. März 2014 in Halle.

Hauzenberger, C.A.; Bagola, C., Haeger, T., Muellen, C., Khoi, N. N. & Le, T.-T. Huong (2014): Mineralogy and Petrology of the An Phu Marble Hosted Spinel

and Corundum Deposit, Luc Yen, N-Vietnam. The 4^th International Gem and Jewelry Conference; Chiang Mai; Thailand. Pp. 76-78.

Journals

Henn, U., Schulz-Güttler, R. & Häger, T. (2014): “Guava Quartz” a new pink gemstone from Brazil. Z. Dt. Gemmol. Ges. 63, 43-47.

Henn, U., Häger, T. & Schmitz, F. (2014): Moonstone – a current perspective. Z. Dt. Gemmol. Ges. 63, 81-100.

Le Thi-Thu Huong, Hofmeister, W., Häger, T., Karampelas, S. & Nguyen Duc-Trung Kien (2014): A preliminary study on the seperation of natural and synthetic emeralds using vibrational spectroscopy. Gems & Gemology, 50, 287-292.

2013

Journals 2013

Zubko, M., Kusz, J., Malczewski, D., Häger, T. & Hofmeister, W. (2013): High Temperature Study of Metamict Rinkite. Solid State Phenomena 203-204; 331-334.

Zink, N., Pansiot, J., Therese, H. A., Emmerling, F., Häger, T., Hahn, A., Panthöfer, M., Tahir, M. N., Kolb, U., Tremel, W. (2013) Low temperature synthesis of monodisperse nanoscaled ZrO₂ with large specific surface area. Dalton Transactions; 42, 432-440.

Conference contributions/workshops 2013

Diep, P.*, Häger, T., Hofmeister, W. (2013): Influence of the Fe content on the 417 cm^–1 and 577 cm^–1 Raman bands of sapphire: CORALS–2013 (Conference on Raman and Luminescence Spectroscopy in the Earth Sciences); 19-20.

Häger, T., Hauzenberger, C., Lehmann, C., Zimmer, D., Nguyen Ngoc Khoi, Duong Anh Tuan, Le Thi-Thu Huong & Hofmeister, W. (2013): Causes of colour of natural untreated spinels from Vietnam in comparison to flame fusion and flux grown synthetics. International gemmological conference (Vietnam).

Häger, T., Hauzenberger, C., Lehmann, C., Zimmer, D., Nguyen Ngoc Khoi, Duong Anh Tuan, Le Thi-Thu Huong & Hofmeister, W. (2013): Element analytical and UV-Vis-NIR study of natural untreated spinels from Vietnam in comparison to synthetics. 5^th European gemmological conference.

Satitkune, S., Zubko, M., Häger, T., Kusz, J., Hofmeister, W. (2013): Residual pressure differences between diamond crystals and their guest inclusions. CORALS–2013 (Conference on Raman and Luminescence Spectroscopy in the Earth Sciences);91-92.

2012

Journals 2012

Le Thi-Thu Huong, Häger, T., Hofmeister, W., Hauzenberger, C. Schwarz, D., Pham Van Long, Wehmeister, U. Nguyen Ngoc Khoi & Nguy Tuyet Nhung (2012): Gemstones from Vietnam: An update. Gems & Gemmology 48; 158-176.

Zwaan, J.C., Jacob, D.E., Häger, T., Mário, T.O., Cavalcanti, N. & Kanis, J. (2012): Emeralds from the Fazenda Bonfim region, Rio Grande do Norte, Brazil. Gems & Gemology, 48, 2-17.

Conference contributions/workshops 2012

Häger, T., Hauzenberger, C., Lehmann, C., Zimmer, D., Nguyen Ngoc Khoi, Duong Anh Tuan, Le Thi-Thu Huong & Hofmeister, W. (2012): Element Analytical and UV-Vis-NIR Study of Natural Untreated Vietnamese and Synthetic Spinels. 3^rd GIT international Gem & Jewelry conference, Bangkok, 181.

Hauzenberger A., Nguyen Ngoc Khoi Chakkaphan Sutthirat, Häger, T., Pornsawat Wathanakul & Duong Anh Tuan (2012): Ruby with associated Spinel Corona from Truc Lau and Kinh La, North Vietnam. 3^rd GIT international Gem & Jewelry conference, Bangkok, 125.

Malley, J., Greiff, S. & Häger, T. (2012): Forensics of gemstones and precious metals. 6th European Academy of Forensic Science Conference (EAFS).

Nguy Tuyet Nhung, Nguyen Thi Minh Thuyet, Hofmeister W., Häger; T., & Le Thi-Thu Huong (2012): Gem Tourmaline from LucYen: Species Determination on the Basis of the Chemical Composition using CLASTOUR Software. 3^rd GIT international Gem & Jewelry conference, Bangkok, 92.

Phan Thi Minh Diep, Häger, T. & Hofmeister, W. (2012): A combination of inclusion and chemical characteristics to separate sapphires from various deposites. 2nd international workshop on spectroscopy and its application, Dan Nang, Vietnam 6-17.

Zubko, M., Kusz, J., Malczewski, D., Häger, T. & Hofmeister, W. (2012): High temperature study of metamict rinkite. XXII Conference on applied crystallography in Targanice Poland, P14 S.102.

2011

Journals 2011

Häger, T. & Le, Thi-Thu Huong (2011): Gemstones from Vietnam. All that Glitters, 28-30.

Le Thi-Thu Huong, Hofmeister, W., Häger, T., Khoi, N.N., Nhung, N.T., Atichat, W. & Pisutha-Arnond, V. (2011): Aquamarine from the Thuong Xuan district, Thanh Hoa Province. Gems & Gemology, 47, 42-48.

Wehrmeister, U., Jacob, D.E., Soldati, A.L., Loges, N., Häger, T. & Hofmeister, W. (2011): Amorphous, nanocrystalline and crystalline calcium carbonates in biological materials. J. Raman Spectrosc., 42, 926–935

2010

Conference Contributions

Häger, T., Dung, P.T., Tuyen, V.P., Wanthanachaisaeng, B. & Hofmeister, W. (2010): Cr³⁺-luminescence a powerful tool in gemmology and gemstone research. 5^th internation workshop on : Provenance and properties of gems and geo-materials. 1-5.

Häger, T., Nguyen Ngoc Khoi, Duong Anh Tuan, Le Thi-Thu Huong & Hofmeister, W. (2010): Ruby and sapphire rimmed by spinel from the Luc Yen – Yen Bai gem mining area, Vietnam. ACTA MINERALOGICA-PETROGRAPHICA ABSTRACT SERIES, IMA 20^th General Meeting of the International Mineralogical Association, 21–27 August, 2010 Budapest, Hungary, 27

Hauzenberger, C., Häger, T., Wathanakul, P., Khoi, N.N., Nantasin, P. & Goessler, W. (2010): Petrology and geochemical characteristics of ruby with associated spinel corona from Truc Lau, N.-Vietnam. 5^th internation workshop on : Provenance and properties of gems and geo-materials. 23-28.

Le, T.T.H., Nguyen, T.C., Hofmeister, W. & Häger, T. (2010): Discrimination of emerald origins by chemical components. Geochimica et Cosmocimica Acta, 74, A571.

Qader, M., Häger, T., Kersten, M., Drebert, J. & Gerstmann, U. (2010): Identification of corrosion products formed in soil on depleted Uranium ammunition. GeoDarmstadt 2010.

Satitkune, S., Zubko, M., Häger, T., Kusz, J. & Hofmeister, W. (2010): Mineral chemistry and structural relationships of inclusions in diamond crystals. ACTA MINERALOGICA-PETROGRAPHICA ABSTRACT SERIES, IMA 20^th General Meeting of the International Mineralogical Association, 21–27 August, 2010 Budapest, Hungary, 25

Soldati, A.L., Jacob, D., Wehrmeister, U., Meibom, A., Loges, N. & Häger, T. (2010): Micro- and nanoscale studies of MN incorporation in bivalve shells. Geochimica et Cosmocimica Acta, 74, A976.

Tanh, N.T., Thoong, S., Quang, V.X., Tuyen, V.P., Ha, V.T.T., Dung, P.T., Nasdala, L., Häger, T. & Hofmeister, W. (2010): Thermoluminescence of zircon: Dy³⁺ a novel tool for study on annealing process of natural metamict zircon. 5^th internation workshop on : Provenance and properties of gems and geo-materials. 13-18.

Thuyet, N.T.T., Nhung, N.T., Hofmeister, W. & Häger, T. (2010): Amazonite from the Luc Yen mining, Yen Bai, Vietnam. 5^th internation workshop on : Provenance and properties of gems and geo-materials. 40-51.

Tuyen, V.P., Hanh, N.P., Quang, V.X., Thanh, N.T., Dung, P.T., Ha, L.H., Nasdala, L., Häger, T. & Hofmeister, W. (2010): Photoluminescence of Dy³⁺ – and defect ions a novel tool in characterization. 5^th internation workshop on : Provenance and properties of gems and geo-materials. 6-12.

Wehrmeister, U., Jacob, D.E., Soldati, A.L., Loges, N. & Häger, T. & Hofmeister, W. (2010): Determination of amorphous and nanocrystalline calcium carbonate polymorphs in pearls by Raman spectroscopy. ACTA MINERALOGICA-PETROGRAPHICA ABSTRACT SERIES, IMA 20^th General Meeting of the International Mineralogical Association, 21–27 August, 2010 Budapest, Hungary, 378.

Journals

Henn, U. Häger, T. & Milisenda, C. (2010): A contribution to the topic of onyx. Z. Dt. Ges. Edelsteinkunde, 59, 83-94.

Kusz, J., Malczewski, D., Zubko, M., Häger, T. & Hofmeister, W. (2010): High temperature study of metamict steenstrupine. Solid State Phenomena Vol. 163, 253-255.

Le Thi-Thu Huong, Häger, T. & Hofmeister, W. (2010): Confocal Micro-Raman-Spectroscopy: A powerful tool to identify natural and synthetic Emeralds. Gems & Gemology, 46, 36-41.

Sonibare, O.O., Haeger, T., Foley, S.F. (2010): Structural characterization of Nigerian coals by X-ray diffraction, Raman and FTIR spectroscopy. Energy, 35, 5347-5353.

Wehrmeister, U., Soldati, A.L., Jacob, D.E., Häger, T. & Hofmeister, W. (2010): Raman spectroscopy of synthetic, geological and biological vaterite: a Raman spectroscopic study. Journal of Raman Spectroscopy. 41, 193-201.

2009

Journals 2009

Váczi, T., Nasdala, L., Wirth, R., Mehofer, M., Libowitzky, E. & Häger, T. (2009): On the breakdown of zircon upon “dry” thermal annealing. Miner. Petrol. 97:129–138.

Conference contributions/workshops 2009

Le.T.T.H., Häger, T. & Hofmeister, W. (2009): Classification of Water Types in Structural Channels of Beryl by means of Raman Spectroscopy. 2^nd GIT international conference in Bangkok, 90.

Le.T.T.H., Nhung. N.T., Khoi, N.N., Häger, T. & Hofmeister, W. (2009): A Study on Aquamarines from Thuong Xuan Deposit (Thanh Hoa Province, Vietnam). 2^nd GIT international conference in Bangkok, 159.

Milisenda, C.C., Furuya, M. & Häger, T. (2009): A Study on Treated Red Labradorite-Andesine Feldspars. 2^nd GIT international conference in Bangkok, 283.

Satitkune, S., Zubko, M., Häger, T., Kusz, J. & Hofmeister W. (2009): Orientation of Single Crystal Mineral Inclusions in Diamonds and Pressure Differences between Host Crystals and Guest Inclusions. 2^nd GIT international conference in Bangkok, 140.

Soldati, A.L., Jacob, D.E., Wehrmeister, U., Häger, T. & Hofmeister, W. (2009): Pearl Micro-and Nanostructure, Mineralogy and Composition: Factors Affecting Quality and Provenance Studies. 2^nd GIT international conference in Bangkok, 206.

Soldati, A.L., Jacob, D.E., Wehrmeister, U., Häger, T. & Hofmeister, W. (2009): Pigments in Vaterite in Freshwater Cultured Pearls: A Micro Raman Spectrometry Study. 2^nd GIT international conference in Bangkok, 210.

Váczi, T., Nasdala, L., Wirth, R., Mehofer, M., Libowitzky, E. & Häger, T. (2009): Decomposition texture after dry thermal annealing of zircon. MITT.ÖSTERR.MINER.GES. 155 (2009).

Wanthanachaisaeng, B., Häger, T. & Hofmeister, W. (2009): Detection of Heat Treatment in Rubies and Sapphires from Ilakaka. 2^nd GIT international conference in Bangkok, 86.

Vaterite Influences Lustre and Quality of Freshwater Cultured Pearls. 2^nd GIT international conference in Bangkok, 218.

2008

Journals 2008

Liebe, D., Eberhardt, K., Hartmann, W., Häger, T., Hübner, A., Kratz, J.V., Kindler, B., Lommel, B., Thörle, P. Schädel, M., Steiner, J. (2008): The application of neutron activation analysis, scanning electron microscope, and radiographic imaging for the characterization of electrochemically deposited layers of lanthanide and actinide elements. Nuclear Instruments and Methods in Physics Research A 590 145-150.

Nasdala, L., Hofmeister, W., Norberg, N., Mattinson,J.M., Corfu,F., Dörr,W., Kamo, S.L., Kennedy, A.K., Kronz, A., Reiners, P.W., Frei, D., Kosler, J., Wan, Y., Götze, J., Häger T., Kröner, A. & Valley, J.W. (2008): Zircon M257 – a homogeneous natural reference material for the ion microprobe U-Pb analysis of zircon. Geostandards and Geoanalytical Research, 32, 247-265

Soldati, A.L., Jacob, D.E., Wehrmeister, U., Häger, T. & Hofmeister, W. (2008): Micro-Raman spectroscopy of pigments contained in different calcium carbonate polymorphs from freshwater cultured pearls. Journal of Raman spectroscopy; 39 525-536.

Conference contributions/workshops 2008

Le T.T. Huong, Häger, T. & Hofmeister W. (2008): Classification of water types in structural channels of beryl by means of Raman spectroscopy. Proceedings of the 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 38-43, Hanoi/Vietnam.

Le T.T. Huong, Häger, T. & Hofmeister, W. (2008): On some controversially discussed Raman and IR bands of beryl. Proceedings of the 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 48-58, Hanoi/Vietnam.

Satitkune, S., Zubko, M., Häger, T., Kusz, J., & Hofmeister, W. (2008): Orientation of single crystal pyrope inclusions in diamond and pressure differences between host crystals and guest inclusions. Proceedings of tthe 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 44-47, Hanoi/Vietnam.

Soldati, A.L., Jacob, D.E., Wehrmeister, U., Häger, T. & Hofmeister, W. (2008): Characterization of polyene pigments in vaterite in freshwater cultured pearls by micro-Raman spectrometry. Proceedings of the 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 217-222, Hanoi/Vietnam.

Wanthanachaisaeng, B., Häger, T. & Hofmeister, W. (2008): Detection of „Low temperature” heat treatment in rubies and sapphires from Ilakaka. Proceedings of the 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 59-63, Hanoi/Vietnam.

Wehrmeister, W., Jacob, D.E., Soldati, A.L., Xu, W., Häger, T. & Hofmeister, W.: (2008):Identification of vaterite in cultured pearls by non-destructive methods. Proceedings of the 4. International Workshop on Geo- and material.Science on Mineral Resources of Vietnam. 1-8, Hanoi/Vietnam.

Zubko, M., Satitkune, S., Häger, T., Hofmeister, W. Kusz J. (2008): Orientation of mineral single crystal inclusions in diamonds. 50th Polish Crystallographic Meeting, Wrocław, 26-28 VI 2008 p. 282

2007

Journals 2007

Jacob, D. E.; Wehrmeister, U.; Häger, T. & Hofmeister, W. (2007). Identifying Kasumigaura Pearls. Pearl World 16(2): 25-28.

Wehrmeister, U.; Jacob, D.; Soldati, A.; Häger, T. & Hofmeister, W. (2007). Vaterite in freshwater cultured pearls from China and Japan. Zeitschrift Deutsche Gemmologische Gesellschaft, 3/4, 99-118.

Wehrmeister, U., Jacob, D.E., Soldati, A.L., Häger, T. & Hofmeister, W. (2007): Vaterite in freshwater cultured pearls from China and Japan. Journal of Gemmology 30, 399-412.

Conference contributions/workshops 2007

Häger, T. (2007): The absorption edge of ruby and sapphire UV-Vis-Spectra. AOGS 4^th Annual Meeting in Bangkok

Hampel, J., Zauner, S., Häger, T., Banerjee, A., Hampel, G. (2007): Instrumental Neutron Activation Analysis (INAA) of mineralogical samples; SAAGAS21

Hauzenberger, C., Häger, T. & Sutthirat, C (2007): Petrology, Chemical and Oxygen Isotope Composition of Asian and East African Ruby and Sapphire Deposits. AOGS 4^th Annual Meeting in Bangkok

Ruschel, K., Nasdala, L., Miletich, R., Hanchar, J.M., Wantanachaisaeng, B. & Häger, T. (2007): Spectral changes of zircon at elevated pressure. – Mitt. Österr. Miner. Ges., 153, 98.

Kusz, J., Malczewski, D., Zubko, M., Häger, T., & Hofmeister, W. (2007): PORZĄDKOWANIE SIĘ STRUKTURY KRYSZTAŁÓW METAMIKTYCZNYCH PODCZAS WYGRZEWANIA. 49 Konwersatorium Krystalograficzne

Sesja Naukowa PTK. B72.

Váczi, T., Nasdala, L., Wirth, R., Wanthanachaisaeng, B. & Häger, T. (2007): Potential problems in the annealing of zircon. – Abstracts of the 17th Goldschmidt Conference, Cologne, Germany, p. A1049.

Wanthanachaisaeg, B. & Häger, T. (2007): Crystallinity and Phase Change of Zircon Inclusions in Corundum from Ilakaka, Madagascar Caused by Heat Treatment. AOGS 4^th Annual Meeting in Bangkok

Wanthanachaisaeng, B. & Häger, T. (2007): Crystallinity and phase change of zircon inclusions in corundum from Ilakaka, Madagascar caused by heat treatment, AOGS 4^th Annual Meeting in Bangkok.

Wongkokua, W., Wathanakul, P., Wanthanachaisaeng, B. and Haeger, T. 2007. LA-ICP-MS and Photoluminescence Study of Beryllium Heat-treated Songea Corundum Samples. German-Thai Symposium on Nanoscience and Nanotechnology. Bangsaen, Chonburi, Thailand. September 27-28, 2007. p. 48-51.

2006

Journals 2006

Jacob, D., Wehrmeister, U., Häger, T. & Hofmeister, W. (2006). “Identifying Japanese Freshwater Cultured Pearls From Lake Kasumiga.” The Australian Gemmologist 22(12): 539-541.

Jacob, D. E., Wehrmeister, U., Häger, T. & Hofmeister, W. (2006). “Origin determination of freshwater cultured pearls using Laser Ablation ICP-MS.” Z.Dt.Gemmol. Ges. 55(1-2): 51-58.

Pisutha-Arnond, V., Häger, T., Atichat, W. & Wathanakul, P. (2006): The role of Be, Mg, Fe and Ti in causing colour in corundum. Journal of Gemmology, 30, 131-143.

Pisutha-Arnond, V., Häger, T., Wathanakul, P., Atichat, W., Nattachai, J., Win, T., Sutthirat, C. & Sriprasert, B. (2006): Role of Beryllium in the Coloration of Fe- and Cr-doped Synthetic corundum. Gems & Gemology 42, 85.

Schmetzer, K., Schwarz, D., Bernhardt, H.-J. & Häger, T. (2006): A new type of Tairus hydrothermally-grown synthetic emerald, coloured by vanadium and copper. J. Gemmology, 30, 59-74

Wanthanachaisaeng, B., Häger, T., Hofmeister, W. & Nasdala, L. (2006): Raman and fluorescence spectroscopic properties of zircon inclusions in chromium-bearing corundum from Ilakaka and their alteration by heat treatment. Z. Dt. Gemmol. Ges. 55, 123-136.

Wehrmeister, U. & Häger, T. (2006): Identifying gemstones – Properties and treatment – Rühle-Diebener-Verlag Stuttgart

Conference contributions/workshops 2006

Eberhardt, K., Häger, T., Kratz, J.V., Liebe, D., Lommel, B., Schädel, M., Schimpf, E., Thörle, P., Trautmann, N., Wunderlich, T.(2006): Preparation of Actinide Targets by Electrodeposition for Heavy Element Studies and Laser Spectroscopic Investigations. Workshop on the Atomic Properties of the Heaviest Elements, 25-27.09.2006

Häger, T. (2006): Luminescence of Cr³⁺ in Gemmology. Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Hampel, G, Hampel, J., Zauner, S., Häger, T. & Banerjee, A. (2006): Use of Neutron Activation Analysis for the determination of Elements in Ivory. 3rd INCENTIVS meeting “Symposium in the Ivory Tower” from 11-12 April 2006, Mainz

Hampel, G., Hampel, J., Heimann, R., Zauner, St. & Häger, T. (2006): Radioactivity of various minerals in gemstone quality. 38. Jahrestagung des Deutsch-Schweizerischen Fachverband für Strahlenschutz / Strahlenschutz-Aspekte bei natürlicher Radioaktivität. ISSN-1013-4506 TÜV-Verlag, 456-463.

Jacob, D., Wehrmeister, U., Häger, T. & Hofmeister, W. (2006). Origin determination of freshwater cultured pearls from Lake Biwa (Japan), Kasumigaura (Japan) and China. Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Jacob, D., Wehrmeister, U., Häger, T. & Hofmeister, W. (2006). Provenance determination of freshwater cultured pearls by Laser Ablation ICP-MS. AOGS 3^rd Annual Meeting in Singapore.

Liebe, D., .Eberhardt, K., Kratz, J.V. & Häger, T. (2006). The Application of Neutron Activation Analysis, Scanning Electron Microscope, and Radiographic Imaging for the Characterization of Electrochemically Deposited Layers of Lanthanide and Actinide Elements, Proceedings of the 23^rd INTDS Conference, Tsukuba, Japan (15-20^th October 2006), submitted to Nucl. Instr. Meth

Liebe, D., .Eberhardt, K., Kratz, J.V. & Häger, T. (2006): Chemical composition of molecular plated depositions of lanthanides and actinides investigated by Energy X-ray Spectrometry (EDS)

Sakkaravej, S., Sutthirat, C., Pisutha-Arnond, V., Atichat, W., Wathanakul, P., Pumpeng, S. & Häger, T. (2006): Thermal enhancement of some blue sapphires from Ilakaka-Sakaraha deposits, Madagascar. Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Wanthanachaisaeng, B. & Häger, T. (2006): Raman spectroscopic study of metamict zircon inclusions in corundum and their behavior on heat treatment. Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Wanthanachaisaeng, B. & Häger, T., (2006a): Abstract: Pressure-mapping around inclusions in corundum crystals determined by the shift of Cr³⁺ luminescence bands. AOGS 3^rd Annual Meeting.

Wanthanachaisaeng, B. & Häger, T., (2006b): Pressure determination around metamict zircon inclusions in corundum and their behavior on heat treatment; Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Wathanakul, P., Häger, T., Atichat, W., Pisutha-Arnond, V., Win, T., Lomthong, P., Sriprasert, B. & Sutthirat, C. (2006): Beryllium-Assisted heat treatment experiments on blue sapphires. Gems & Gemology, 42, 87.

Wathanakul, P., Shim, K.B., Häger, T., Pisutha-Arnond, V., Wongkokua, W., Leelawatanasuk, T., Mhin, S.W. & Jakkravalvibul, C. (2006): Nano inclusion and colorations in some gem corundums.

Proceeding of the 1^st GIT International Gem & Jewelry Conference (GIT 2006), Bangkok & Chantaburi.

Journals

Schmetzer, K., Schwarz, D., Bernhardt, H.-J. & Häger, T. (2006): A new emerald synthesis by Tairus.- Goldschmiede Zeitung; 1/2006, 102-103

2005

Journals 2005

Henn, U., Milisenda, C.C. & Häger, T. (2005): Chatoyance and asterism in feldspar from Tanzania. – Z. Dt. Gemmol. Ges. 54, 43-46.

Conference contributions

Wolfgang Hofmeister, Vu Xuan Quang, Tran Nghi, Nguyen Qui Dao, Nguyen Th Khoi & Tobias Häger (Eds.) (2005): Gem-Materials and Modern Analytical Methods. Hanoi (Vietnam).

Greiff, S., Gerick, A., Ritz, A., Häger, T., Junchang, Y. (2005): “Identifying Princess Li Chui’s Last Treasures, 35^th International Symposium on Archaeometry” from 11-15.5. in Beijing, Conference Abstracts S4-11

Hauzenberger, C., Häger, T., Sutthirat, C., Kienzl, N. & Bojar, A.V. (2005): Geochemical characterization of corundum from different gem deposits: a stable isotope and trace element study. – Third international workshop on Gem-Materials and Modern Analytical Methods; Hanoi, September 26-October 2005. 55-62.

Houng, L.T.T. Hofmeister, W. & Häger, T. (2005): Discrimination of provenance and origin of emeralds and synthetic analogues by solid-state-spectroscopy and inclusion analysis. Third international workshop on Gem-Materials and Modern Analytical Methods; Hanoi, September 26-October 2005. 27-38.

Jacob, D., Wehrmeister, U., Häger, T. & Hofmeister, W. (2005): Origin determination of freshwater cultured pearls. Goldschmiede Zeitung 11/2005, 54-55.

Jacob, D., Wehrmeister, U. & Häger, T. (2005): Provenance determination of freshwater cultured pearls by LA-ICP-MS. – Agilent ICP-MS Journal, 25; 4-5.

Sakkaravej, S., Sutthirat, C., Pisutha-Arnond, V. (2005): Characteristics and thermal treatment of blue shade sapphires from Ilakaka-Sakalaha deposits, Madagascar. – Third international workshop on Gem-Materials and Modern Analytical Methods; Hanoi, September 26-October 2005. 255-262.

Wanthanachaisaeng, B., Häger, T. & Hofmeister, W. (2005): Determination of pressure around inclusions in corundum crystals by the shift of Cr³⁺ luminescence bands. – Third international workshop on Gem-Materials and Modern Analytical Methods; Hanoi, September 26-October 2005. 125-134.

2004

Conference contributions

Pisutha-Arnond, V., Haeger, T., Wathanakul, P., Atichat, W., Win, T.T., Leelawatanasuk, T., Somboon, C., Sutthirat, C. 2004. Chemical Characteristic of “Classical” versus “Beryllium” Heat-Treated Ruby and Sapphire. 29th I G C, Wuhan, China, September 12-21, 2004. P. 92-94.

Weikusat, C., Nasdala, L. & Häger, T. (2004): Spectroscopic study of Canada balsam as filler substance in emerald. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 149: 107.

2003

Conference contributions

Dzung P.T., Nguyen T.L., Tran N., Quang, V.X. & Häger, T. (2003): Some optical properties of Vietnamese zircon. Geo- and Material-Science on Gem-Minerals of Vietnam; Proceedings of the International Workshop, Hanoi, October 01-08, 2003.

Häger,T., Priester, M., Rupasinghe, M. & Mackay, H. (2003): Best practice in small-scale mining – Information and source material on gemstone identification and valuation. Printed in Sinhalese – a draft English version can be found: http://www.itcltd.com/docs/Gemstones%20Manual%20-%20draft.pdf

Häger T. & Dzung P.T. (2003): Quantitative laser-induced photoluminescence and cathodoluminescence spectroscopy of natural and synthetic rubies. Geo- and Material-Science on Gem-Minerals of Vietnam; Proceedings of the International Workshop, Hanoi, October 01-08, 2003

Hauzenberger, C.; Häger, T., Hofmeister, W., Quang, V.X., & Fernando, R. (2003): Origin and formation of gem quality corundum from Vietnam. Geo- and Material-Science on Gem-Minerals of Vietnam; Proceedings of the International Workshop, Hanoi, October 01-08, 2003.

Tuyen V.P., Hofmeister, W. & Häger T. (2003): Gem spinel crystal from Vietnam: crystal chemistry and spectroscopic characterization. Geo- and Material-Science on Gem-Minerals of Vietnam; Proceedings of the International Workshop, Hanoi, October 01-08, 2003

Visut P.-A., Pornsawat W., Wilawan A. Häger, T. Tin T.W., Thanong L. & Chaniya S. (2003): Beryllium-treated Vietnamese and Mong Hsu rubies. Geo- and Material-Science on Gem-Minerals of Vietnam; Proceedings of the International Workshop, Hanoi, October 01-08, 2003.

2002

Pisutha-Arnond, V., Haeger, T., Wathanakul, P. and Atichat, W. (2002). A brief summary on a cause of colour in pink-orange, orange and yellow sapphires produced by the “new” heating technique. Journal of Gem and Jewelry, Gem and Jewelry Institute of Thailand (GIT), 3(18), 11-12.

2001

Conference contributions

Häger, T. (2001): Heat treatment of rubies and sapphires and their causes of colour. International workshop in Hanoi, Vietnam.

Häger, T. (2001): Characterisation of gemstones. Gemstones of the world and in Vietnam (in Vietnamese). 261-278.

Häger, T. (2001): Causes of color of corundum and their reaction to heat. International Conference for geochemistry “Goldschmidt” in Virginia, USA

Journals

Nasdala, L., Banerjee, A., Häger, T. & Hofmeister, W. (2001): Laser Raman Micro-Spectroscopy in Mineralogical Research. Microscopy and Analysis Europ. Edit. 70; 7-9.

2000

Conference contributions

Goldberg, R., Häger, T., Hofmeister, W. & Quang, V.X. (2000): Spectroscopic investigations on ordering in Cr-doped Vietnamese and synthetic spinels. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 12,

Dung, P.T., Häger, T. & Hofmeister, W. (2000): Cause of colour and elimination of blue zones in Vietnamese rubies. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 12,

Häger, T. & Dung, P. T. (2000): Quantitative fluorescence spectroscopy of natural and synthetic rubies. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 12,

Häger, T. (2000): Heat treatment of rubies and sapphires and their causes of colour. Symposium for treatment and characterisation in Ouro Preto, Brazil.

Hofmeister, W., Hauzenberger, C.A., Häger, T. & Baumgartner, L.P. (2000) Metamorphic-metasomatic mineralizations of the North Vietnamese corundum-spinel deposits. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 12,

Häger, T. (2000): Oxidizing Heat Treatment of Sapphires at 1850°C. International Geological Congress.

1999

Conference contributions

Dung, P.T., Häger, T., Quang V.X. & Hofmeister, W. (1999): Rubies from Vietnam. 17th General Meeting of the International Mineralogical Association. S. A14

Häger, T. (1999): Interaction of trace elements in corundum. 17th General Meeting of the International Mineralogical Association. S. A14

Journals

Häger, T. (1999): Treatment of gemstones and their colour. Aufschluß Vol. 50, pp. 349-352.

1996

Häger, T. (1996): Colour-relevant interactions of trace elements in corundum. Doctoral dissertation, Johannes Gutenberg University Mainz.

1994

Conference contributions

Häger, T. & Greiff S. (1994): OH-containing components in corundum and their effects. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 6, p. 89.

1993

Conference contributions

Häger, T. (1993): Stabilization of colour centers in yellow natural sapphires. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 5, p. 188.

Journals

Banerjee A. & Häger T. (1993): Characterization of some Tektites and Silica Glasses with IR – Reflectance Spectroscopy; Chem. Erde ; Vol. 53; pp. 289-291.

1992

Conference contributions

Häger, T. (1992): Colour-producing and “colour-inhibiting” trace elements in blue sapphires. Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 4, p. 109.

Journals

Banerjee A. & Häger T. (1992): On some Crystals of “Lapis Lazuli”; Z. Naturforsch. Vol. 47; pp. 1094-1095.

Greiff S. & Häger T. (1992): The synthesis of gemstones; In: Faszination Edelstein; Bentelli Verlag Bern; pp. 33-40.

1990

Banerjee A. & Häger, T. (1990): A contribution to the colour of Lapis Lazuli; Berichte der Deutschen Mineralogischen Gesellschaft – Beihefte zum European Journal of Mineralogy Vol. 2, p. 12.