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Formula: Bi2O3
Simple oxide, tetragonal paramorph of monoclinic
bismite, bismuth-bearing mineral
Crystal System: etragonal
Specific gravity: 7.17 calculated
Hardness: 4
Streak: White
Colour: Green, pale yellow, grey
Solubility: Soluble in 1:1 hydrochloric and nitric acids
Common impurities: As
Environments
Localities
There are two co-type localities, the Schmiedestollen dump, Wittichen, Schenkenzell, Rottweil, Freiburg Region, and
Neubulach, Calw, Karlsruhe Region, both at Baden-Württemberg, Germany. Sphaerobismoite occurs as an oxidation
product of wittichenite and
emplectite, as crystals to 20 microns in size. Associated minerals include
bismutite, mixite,
malachite, baryte,
quartz and limonite
(HOM, Mindat).
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