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Goldmanite from the black slates of the Ogcheon belt, Korea

Published online by Cambridge University Press:  05 July 2018

G. Y. Jeong  and
Y. H. Kim
G. Y. Jeong
Affiliation:
Department of Earth and Environmental Sciences, Andong National University, Andong 760-749, Korea
Y. H. Kim
Affiliation:
Department of Earth and Environmental Sciences, Andong National University, Andong 760-749, Korea
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Abstract

Goldmanite, the vanadium analogue of grossular and andradite, was found as subrounded green porphyroblasts ranging from 0.1 to 1.7 mm in size in the carbonaceous black slates from the Deokpyeong area of the Ogcheon belt in Korea. A radiating aggregate of slightly curved blades of goldmanite crystals displays birefringence and replaces the fine-grained black matrix. The V2O3 content ranges from 21.9 to 26.6 wt.% (24.0 wt.% average), higher than previously reported values. The calculated mole % of the goldmanite end-member ranges from 72 to 91. Its cell dimension was calculated to be 12.04 Å from X-ray diffraction. The black slate in the Deokpyeong area is the richest known accessible source of relatively pure goldmanite.

Keywords

black slategarnetgoldmanitevanadium
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 2 , April 1999 , pp. 253 - 256
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999 

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