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Bismutite
Chemical Formula	Bi2(CO3)O2
Species	Carbonates
Crystal System	Orthorhombic
Mohs Scale	2-3
Specific Gravity	6.7-7.4
Color	Yellow to brown, greenish, green-grey, grey or black
Streak	Grey
Luster	Vitreous, Pearly, Dull, Earthy
Refractive Index	n = 2.120 - 2.150 n = 2.120 - 2.300
Diaphaneity	Transparent, Translucent
Cleavage	Distinct/GoodOn .
Crystal Habit：Very rare as platy crystals; typically radially fibrous to spheroidal, in crusts and earthy to dense massive aggregates
Geological Setting：Oxidation zones of Bi-bearing ore deposits such as hydrothermal veins and in pegmatites containing bismuthinite and native bismuth.

Bismutite or bismuthite is a bismuth carbonate mineral with formula Bi₂(CO₃)O₂ (bismuth subcarbonate). Bismutite occurs as an oxidation product of other bismuth minerals such as bismuthinite and native bismuth in hydrothermal veins and pegmatites. It crystallizes in the orthorhombic system and typically occurs as earthy to fibrous masses.

It was first described in 1841 for an occurrence in Saxony.