Mukhinite

mukhinite

goldmanite

pyrrhotite

clinozoisite

Images

Formula: Ca₂(Al₂V³⁺)(Si₂O₇)(SiO₄)O(OH)
Sorosilicate (Si₂O₇ groups), epidote group, epidote supergroup
Crystal System: Monoclinic
Specific gravity: 3.47 calculated
Hardness: 8
Streak: Pale brownish grey
Colour: Black with a brownish tint
Luminescence: Not fluorescent under UV
Solubility: Soluble with difficulty in acids, but is dissolved by sulphuric acid after having been fused.
Common impurities: Fe,Cr,Mg,H₂O,S
Environments

Metamorphic environments

Localities

At the type locality, the Tashelginskoye Fe-(Co) deposit, Tashelga River, Gornaya Shoria Region, Kemerovo Oblast, Russia, mukhinite occurs as irregular grains up to 5 mm across, and as irregular, short prismatic crystals up to 1 x 2.5 mm; it is associated with goldmanite in areas of marble enriched in pale green muscovite and disseminated pyrite, pyrrhotite, chalcopyrite and sphalerite (AM 55.317-323).

At the Kuznetsk Alatau Range, Russia, mukhinite occurs as a late-stage mineral in garnet-bearing metamorphic rocks. Associated minerals include garnet, diopside, titanite, quartz, clinozoisite, galena and molybdenite (HOM).

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