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