RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES3002, doi:10.2205/2006ES000196, 2006

2006ES000196-fig08.html
Figure 8. Morphology of Cr-spinels from various ultrabasite rocks (fragments of thin sections, crossed polarizers, magnification 80 times ). (a) Unaltered lherzolite, Voikar-Synninskii Massif, Levaya Paiera River. Protogranular texture. The primary mineral assemblage is Olv + Cpx + Opx + Spl . Cr-spinel occurs as pale brown anhedral grains of Cr-picotite. (b) Coarse-grained dunite, Rai-Iz Massif, Tsentralnoe deposit. The primary mineral assemblage is Olv + Spl ; the secondary assemblage is a-Liz + Brs + Chl . Cr-spinel occurs as black octahedral crystals of chromite. (c) Sadvandite. Zone of prograde metamorphism in the Rai-Iz Massif. The secondary mineral assemblage is Olv2 + Opx3+ Mgt - Act + Tlc + Chl + Mzt . Cr-spinel occurs as black anhedral crystals of magnetite. (d) Harzburgite partly replaced by talc and amphibolite, western contact of the Syum-Keu Massif. The secondary assemblage is Act + Tlc + Chl - a-Liz + Brs + Mzt . Cr-spinel occurs as black anhedral crystals of magnetite.

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Citation: Makeyev, A. B. (2006), Typomorphic features of Cr-spinel and mineralogical prospecting guides for Cr ore mineralization, Russ. J. Earth Sci., 8, ES3002, doi:10.2205/2006ES000196.

Copyright 2006 by the Russian Journal of Earth Sciences
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