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Tuite, gamma -Ca (sub 3) (PO (sub 4) ) (sub 2) ; a new mineral from the Suizhou L6 chondrite

Xie Xiande, Michelle E. Minitti, Chen Ming, Mao Ho-Kwang, Wang Deqiang, Shu Jinfu and Fei Yingwei
Tuite, gamma -Ca (sub 3) (PO (sub 4) ) (sub 2) ; a new mineral from the Suizhou L6 chondrite
European Journal of Mineralogy (December 2003) 15 (6): 1001-1005


Tuite, gamma -Ca (sub 3) (PO (sub 4) ) (sub 2) , the high-pressure polymorph of whitlockite, was found in a shock melt vein of the Suizhou chondrite. It occurs as polycrystalline aggregates in association with coarse-grained aggregates of ringwoodite, majorite and NaAlSi (sub 3) O (sub 8) -hollandite. These high-pressure mineral assemblages are enclosed in the fine-grained matrix of the vein that consists of majorite-pyrope (sub ss) garnet, metal and troilite. This new mineral is trigonal, R3m, a = 5.258 Aa, c = 18.727 Aa. The tuite is colourless and transparent with vitreous lustre and white streak; it is uniaxial (+) with high refractive indices (epsilon = 1.706, omega = 1.701) and low birefringence (0.005). Microprobe analyses of tuite yield an empirical formula (Ca (sub 2.51) Mg (sub 0.29) ) (sub 2.80) Na (sub 0.28) (P (sub 1.01) O (sub 4) ) (sub 2) . The simplified formula, Ca (sub 3) (PO (sub 4) ) (sub 2) , is the same as whitlockite outside the veins. Stronger reflections on synchrotron radiation X-ray powder diffraction pattern of tuite are d = 2.628 (100), 2.891 (80), 1.945 (47), 1.730 (25) and 1.567 (22). The figures in brackets are relative intensities. Tuite in the shock vein of this meteorite was transformed from whitlockite via a shock-produced solid-state reaction, while the pressure and temperature in the shock vein attained 23 GPa and 2000 degrees C. This new mineral and the mineral name (tuite) have been approved by the Commission on New Minerals and Mineral Names of the International Mineralogical Association.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 6
Title: Tuite, gamma -Ca (sub 3) (PO (sub 4) ) (sub 2) ; a new mineral from the Suizhou L6 chondrite
Affiliation: Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou, China
Pages: 1001-1005
Published: 200312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 26
Accession Number: 2004-026345
Categories: Mineralogy of non-silicatesPetrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Carnegie Institution of Washington, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200408
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