Bismutite
A variety of Minerals
What is Bismutite?
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. The term bismuthite has been used in the past for bismuthinite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bismutite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Bismutite Localities Map
See where Bismutite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Yellow to brown, greenish, green-grey, grey or black; colourless or tinted in shades of faint yellow, green, etc. in transmitted light.
- Hardness (Mohs)
- 2.5 - 3.5
- Density
- 8.15 g/cm³
- Streak
- Grey
Chemical Properties
- Chemical Formula
- (BiO)2CO3
- Elements
- Bi, C, O
Also Known As
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Bismutite FAQs
How do I identify Bismutite?
Bismutite can be identified by its hardness of 2.5 - 3.5 on the Mohs scale, Yellow to brown color. Look for these key characteristics when examining specimens.
What color is Bismutite?
Bismutite typically appears in Yellow to brown, greenish, green-grey, grey or black; colourless or tinted in shades of faint yellow, green, etc. in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Bismutite?
Bismutite has a hardness of 2.5 - 3.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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