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

Figure 8. Morphology of Cr-spinels from various ultrabasite rocks
(fragments of thin sections, crossed polarizers, magnification 80
).
(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.

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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