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Sulfosalt

Kochkarite

PbBi₄Te₇
Hardness3.5–4
Crystal systemHexagonal
ClassSulfosalt
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Kochkarite

Kochkarite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula PbBi₄Te₇.

It crystallizes in the hexagonal crystal system (space group P-3m1). It is a member of the Tetradymite structural group.

Key properties: Mohs hardness 3.5–4; specific gravity 13; Metallic. R: (400) —, (420) 59.0, (440) 61.4, (460) 63.8, (480) 66.8, (500) 69.4, (520) 71.2, (540) 72.1, (560) 72.8 luster.

IMA symbol Koc, IMA status: approved, named in 1988.

Found in the heavy mineral fraction of concentrates (Krokhalin deposit, Russia).

It is found associated with Copper, stibnite, berthierite, pyrite, arsenopyrite, quartz (Krokhalin deposit, Russia); moschellandsbergite, mercury (Mexico).

The name is derived from the locality near the Kolyma River, Russia.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more K minerals or help write this entry.