Olkhonskite
Olkhonskite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cr₂Ti₃O₉.
It crystallizes in the monoclinic crystal system. It is a member of the Schreyerite structural group.
Key properties: specific gravity 4.48; Black streak; Metallic luster; optically biaxial.
IMA symbol Olk, IMA status: approved, named in 1993.
Found in quartzite schists, enriched in Cr–V–Ti, interbedded with carbonate-silicate rocks.
It is found associated with Rutile, eskolaite, karelianite, schreyerite, vuorelainenite, quartz, oligoclase, orthoclase.
The name refers to the Ol’khonskaya series of metamorphic rocks in which the mineral occurs.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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