Kieftite
Kieftite is an IMA-recognized mineral species in the sulfide class, with the chemical formula CoSb₃.
It crystallizes in the cubic crystal system (space group Im3). It is a member of the Perovskite, Skutterudite structural group.
Key properties: specific gravity 7.2; Gray streak; Metallic. R: (470) 59.0, (546) 58.7, (589) 58.7, (650) 58.7 luster.
IMA symbol Kie, IMA status: approved, named in 1991.
Found in a polymetallic sulfide skarn deposit.
It is found associated with Chalcopyrite, dyscrasite, bornite, galena, bismuth, silver, gudmundite, tetrahedrite.
The mineral was named to honor Dr. Cornelis Kieft (1924–), for his contributions to ore mineralogy.
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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