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Ca3(V,Cr,Al)2(SiO4)3
Cubic
Goldmanite, a calcium vanadium silicate mineral of the garnet group, is an extremely rare mineral found in the Franklin Marble in close proximity to the Sterling Hill orebody and was obtained by miners working there. It occurs as tiny (0.5 mm), rounded crystals, associated with margarite, corundum, thortveitite, gahnite, grossular, and rutile, in an assemblage described under margarite. No measurements other than X-ray diffraction patterns and microprobe analyses were made. The approximate composition of the extant specimens varies from that of an aluminian, chromian goldmanite (approximately Ca3(V1.6Cr0.2Al0.2)(SiO4)3) to that of a vanadian, chromian grossular (approximately Ca3(Al1.4V0.5Cr0.1)(SiO4)3). The maximum V2O3 content is approximately 21 wt. %; FeO, MnO and MgO are all less than 0.5 wt. %. The studied specimens are the same ones (HU# 103855) first described as uvarovite by Frondel (1972) and later verified as goldmanite by Dunn and Frondel (1990).
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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