Chrombismite
Chrombismite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Bi₁₆CrO₂₇.
It crystallizes in the tetragonal crystal system (space group I4/m).
Key properties: Mohs hardness 5.5; specific gravity 4.5–4.8; Brown streak; Metallic to submetallic luster.
IMA symbol Cbis, IMA status: approved, named in 1995.
A cumulus mineral in ultramafic portions of layered mafic igneous rocks; an accessory mineral in alpine-type peridotites; also detrital. Common in all meteorites, except carbonaceous chondrites, and in lunar mare basalts.
It is found associated with Olivine, enstatite, plagioclase, serpentine, magnetite, ilmenite, pyrrhotite, pentlandite, ulvöspinel.
The name refers to its CHROMium content.
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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