Olkhonskite

olkhonskite

eskolaite

schreyerite

karelianite

Images

Formula: Cr2Ti3O9
Oxide of chromium and titanium
Crystal System: Monoclinic
Specific gravity: 4.48 calculated
Hardness: 8
Streak: Black
Colour: Black
Environments

Metamorphic environments

Localities

At the type locality, the Ol'khonskiye Vorota Strait, Irkutsk Oblast, Russia, olkhonskite forms platy inclusions, 1 to 20 microns wide and 50 to 150 microns, long in rutile. The olkhonskite-bearing rutile occurs in thin layers of quartzite schists that are enriched in chromium, vanadium and titanium. They are interbedded with carbonate-silicate rocks and also contain sillimanite, chromium-bearing kyanite, cordierite, graphite and vanadian-chromian tourmaline (AM 81.251-252).
The olkhonskite is associated with rutile, eskolaite, karelianite, schreyerite, vuorelainenite, quartz, oligoclase and orthoclase (HOM).
Olkhonskite from the Ol'khonskiye Vorota Strait - Image

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