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Uvarovite and grossular from the Fengtien nephrite deposits, eastern Taiwan

Published online by Cambridge University Press:  05 July 2018

Hsien-Ming Wan  and
Chun-Lu Yeh
Hsien-Ming Wan
Affiliation:
Mining Research and Service Organization, Industrial Technology Research Institute, 1 Tun Hwa South Road, Taipei 105, Taiwan
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Abstract

Uvarovite and grossular, the former comparatively rare, occur along the serpentinite-graphite schist contact in the Fengtien area, on the eastern slope of the Central Range of Taiwan. Uvarovite occurs as small emerald-green euhedral crystals on diopside-fels with dodecahedral crystal forms and many other modifications. Its refractive index is 1.782, specific gravity 3.702, and unit cell edge 11.912 Å. Chemical and probe analyses give average Cr2O3 contents of 11.60 wt. %; spectrographic analysis shows significant enrichment in Cr, Be, Co, Y, Sb, and La over grossular. Associated minerals include nephrite, diopside, tremolite asbestos, zoisite, and clinozoisite. Grossular is reddish-brown; large crystals, dodecahedral in form often modified by trapezohedrons, are associated with diopside, idocrase, and calcite. n = 1.746, SG = 3.636, and a = 11.866 Å. Structurally and chemically it is quite near the grossular end member. Grossular is considered to be formed from pneumatolysis associated with the intrusion of ultramafic rocks, whereas uvarovite is a replacement product of relict chromite in the original ultramafic rocks where migration of elements such as silicon and calcium from wall rocks are prominent.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 346 , March 1984 , pp. 31 - 37
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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Footnotes

*

See note on p. 37.

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