Purple to purplish red chromium-bearing taaffeites

Gems and Gemology

Volumn 36, Issue 1, 2000, Pages 50-59

  Schmelzer, Karl ^a   Kiefert, Lore ^b   Bernhardt, Heinz Jürgen ^c  

^a SSEF Swiss Gemmological Institute ^*

^b Swiss Gemmological Institute SSEF   (Switzerland)

^c RUHR UNIVERSITY BOCHUM   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 22544435629     PISSN: 0016626X     EISSN: None     Source Type: Journal    
DOI: 10.5741/gems.36.1.50     Document Type: Article

References (37)

1. Anderson B.W., Payne C.J., Claringbull G.F., Hey M.H. (1951) Taaffeite, a new beryllium mineral, found as a cut gem-stone. Mineralogical Magazine, Vol. 29, pp. 765-772.
2. Bank H., Henn U. (1989) Changierender Taaffeit aus Sri Lanka. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 38, No. 2/3, pp. 89-94.
3. Burford M. (1997) Two zincian rarities. Canadian Gemmologist, Vol. 18, No. 4, pp. 105-110.
4. Burford M. (1998) Gemstones from Tunduru, Tanzania. Canadian Gemmologist, Vol. 19, No. 4, pp. 108-110.
5. Chadwick B., Friend C.R.L., George M.C., Perkins W.T. (1993) A new occurrence of musgravite, a rare beryllium oxide, in the Caledonides of north-east Greenland. Mineralogical Magazine, Vol. 57, pp. 121-129.
6. Demartin F., Pilati T., Gramaccioli C.M., de Michele V. (1993) The first occurrence of musgravite as a faceted gemstone. Journal of Gemmology, Vol. 23, No. 8, pp. 482-485.
7. Fryer C., Ed. (1982) Gem Trade Lab notes: World's largest taaffeite? Gems & Gemology, Vol. 18, No. 1, p. 49.
8. Gillet P., Biellmann C., Reynard B., McMillan P. (1993) Raman spectroscopic studies of carbonates. Part I: High-pressure and high-temperature behaviour of calcite, magnesite, dolomite and aragonite. Physics and Chemistry of Minerals, Vol. 20, No. 1, pp. 1-18.
9. Gübelin E.J., Koivula J.I. (1986) Photoatlas of Inclusions in Gemstones. ABC Edition, Zurich, pp. 174, 426.
10. Gunawardene M. (1984a) Inclusions in taaffeites from Sri Lanka. Gems & Gemology, Vol. 20, No. 3, pp. 159-163.
11. Gunawardene M. (1984b) Die innnere Paragenese von Taaffeiten aus Sri Lanka. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 33, No. 3/4, pp. 91-95.
12. Herman R.G., Bogdan C.E. (1985) Laser Raman microprobe study of the identification of some carbonate and aluminosilicate minerals. Materials Science Research, Advanced Materials Characterization 2, Vol. 19, pp. 113-130.
13. Herman R.G., Bogdan C.E., Sommer A.J., Simpson D.R. (1987) Discrimination among carbonate minerals by Raman spectroscopy using the laser microprobe. Applied Spectroscopy, Vol. 41, No. 3, pp. 437-440.
14. Johnson M.L., Koivula J.I., Eds. (1997) Gem News - Musgravite: A rarity among the rare. Gems & Gemology, Vol. 33, No. 2, pp. 145-147.
15. Kampf A.R. (1991) Taaffeite crystals. Mineralogical Record, Vol. 22, No. 5, pp. 343-347.
16. Kawakami S. (1983) Manufacture of Single Crystal of Taaffeite [in Japanese]. Japanese Patent Application, open-laid No. 58-55396, April 1.
17. Kiefert L., Schmelzer K. (1998) Distinction of taaffeite and musgravite. Journal of Gemmology, Vol. 26, No. 3, pp. 165-167.
18. Koivula J.I. (1980-1981) Gübelin identifies apatite in taaffeite. Gems & Gemology, Vol. 16, No. 12, pp. 409.
19. Koivula J.I., Kammerling R.C., Eds. (1990) Gem news: Red taaffeite. Gems & Gemology, Vol. 26, No. 1, pp. 102-103.
20. Koivula J.I., Kammerling R.C. (1991) Gemological examination of a red taaffeite. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 40, No. 1, pp. 33-37.
21. Liddicoat R.T., Jr. (1967) Developments and highlights at the Gem Trade Lab in Los Angeles: Taaffeite proves largest. Gems & Gemology, Vol. 12, No. 7, pp. 212-215.
22. McDowell R.B. (1984) A recent find of taaffeite. Journal of Gemmology, Vol. 19, No. 1, pp. 9-13.
23. Miyasaka H. (1987) Production of Taaffeite Single Crystal [in Japanese]. Japanese Patent Application, open-laid No. 62-187200, August 15.
24. Moor R., Oberholzer W.F., Gübelin E. (1981) Taprobanite, a new mineral of the taaffeite-group. Schweizerische Mineralogische und Petrographische Mitteilungen, Vol. 61, pp. 13-21.
25. Ponahlo J. (1993) Kathodolumineszenz (KL) und KL-Spektren von Edelsteinen (Ausgewählte Beispiele) Teil II. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 42, No. 4, pp. 149-162.
26. Saul J., Poirot J.-P. (1984) Le premier cristal de taaffeite gemme? Revue de Gemmologie a.f.g., No. 78, p. 28.
27. Schmetzer K. (1983a) Crystal chemistry of natural Be-Mg-Aloxides: taaffeite, taprobanite, musgravite. Neues Jahrbuch für Mineralogie Abhandlungen, Vol. 146, No. 1, pp. 15-28.
28. Schmetzer K. (1983b) Taaffeite or taprobanite - a problem of mineralogical nomenclature. Journal of Gemmology, Vol. 18, No. 7, pp. 623-634.
29. Schmetzer K., Bank H. (1985) Zincian taaffeite from Sri Lanka. Journal of Gemmology, Vol. 19, No. 6, pp. 494-497.
30. Schmetzer K., Bank H., Gübelin E. (1980) The alexandrite effect in minerals: Chrysoberyl, garnet, corundum, fluorite. Neues Jahrbuch für Mineralogie Abhandlungen, Vol. 138, No. 2, pp. 147-164.
31. Schmetzer K., Bernhardt H.-J., Medenbach O. (1999) Heat-treated Be-Mg-Al oxide (originally musgravite or taaffeite). Journal of Gemmology, Vol. 26, No. 6, pp. 353-356.
32. Schmetzer K., Haxel C., Amthauer G. (1989) Colour of natural spinels, gahnospinels and gahnites. Neues Jahrbuch für Mineralogie Abhandlungen, Vol. 160, No. 2, pp. 159-180.
33. Spengler W. (1983) Burmese parcel reveals rare find. Jewellery News Asia, Vol. 1, No. 1, p. 39.
34. 3+ ions in magnesium spinel at room and liquid nitrogen temperatures. Optics and Spectroscopy, Vol. 35, No. 1, pp. 59-61.
35. Taaffeite found in Tunduru (1996) Jewellery News Asia, No. 142, p. 58.
36. Teraishi K. (1984a) Taaffeite Mineral Crystal [in Japanese]. Japanese Patent Application, open-laid No. 59-137391, August 7.
37. Teraishi K. (1984b) Synthesis of Artificial Taaffeite Single Crystal [in Japanese]. Japanese Patent Application, open-laid No. 59-141484, August 14.