Sphaerobismoite
Sphaerobismoite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Bi₂O₃.
It crystallizes in the tetragonal crystal system (space group P-42_1c).
Key properties: Mohs hardness 4; specific gravity 7.17; White streak; Adamantine to dull luster; optically uniaxial.
IMA symbol Sbm, IMA status: approved, named in 1993.
An oxidation product of wittichenite and emplectite.
It is found associated with Bismutite, mixite, malachite, barite, quartz, “limonite”.
In allusion to the spherical aggregates, and bismuth in its composition.
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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