Uvarovite


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uvarovite

[ü′var·ə‚vīt]
(mineralogy)
Ca3Cr2(SiO4)3 The emerald-green, calcium-chromium end member of the garnet group. Also known as ouvarovite; uwarowite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Uvarovite

 

(named after S. S. Uvarov), a mineral of the garnet group, Ca3Cr2[Si04]3, with a characteristic emerald-green color. A rare mineral, uvarovite is usually found in the form of druses of tiny crystals confined to cracks in chromite ores.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Associations with chromite in the district include greenish yellow serpentine, stichtite, uvarovite and transparent gray spherules of prehnite.
Uvarovite [Ca.sub.3][Cr.sub.2](Si[O.sub.4])[.sub.3]
Uraninite, however, was noted in samples from Big Creek associated with quartz, uvarovite and fresnoite.
Small chromitite bodies near Brassey Hill contain uvarovite, native copper and a varied assemblage of platinum-group minerals (Carthew and Bellairs, 1988; Peck, 1990; Peck and Keays, 1990).
Minerals from the Urals are also comprehensively represented, including ferroaxinite from Puiva, alexandrite and emeralds from the Malyshevo pits, uvarovite from the Saranovskoye deposit, and even the famous Urals malachite from Gumeshki and Vysokogorskoye.
Jaroslav Hyrsl (Heverova 222, 280 00 Kolin 4, Czech Republic) did show me a new development from the Sarany, Urals, locality for uvarovite on chromite (these microcrystalline specimens also continue abundant, by the way).
Some fifty years later, Dresser and Denis (1949) remarked that "the dump at the Orford nickel mine has long been a place of interest for mineralogists on account of the excellent specimens of the relatively rare mineral millerite, and also of uvarovite [grossular] and diopside, that may be collected there." Today, more than a century after mining ceased, the locality continues to be an active mineral collecting site, still producing specimens which are often superior to those in old collections.
For many years the green garnet from the Orford nickel mine has been incorrectly called "uvarovite." In the earliest references it was referred to simply as "chrome garnet" (Hunt, 1863a; Willimot, 1882) based on Hunt's analysis which showed Al>CR.
The uvarovite on chromite from Sarany, Urals, seems capable after all of occasionally forming macroscopic crystals; a couple of the Syntaxis thumbnails have well individualized, half emedded, bright green 2-mm dodecahedrons.
Many genera of the Drymadusini (as well as the non-Drymadusini Gampsocleis and Uvarovites) possess a prosternum with spines (see Rentz & Colless 1990, characters, state 1; also inDelodusa, own observations).