Daubréeite
A variety of Matlockite Group
What is Daubréeite?
For the iron chromium sulfide mineral see Daubréelite Daubréeite is a rare bismuth oxohalide mineral with formula BiO(OH,Cl). It is a creamy-white to yellow-brown, soft, earthy clay–like mineral which crystallizes in the tetragonal crystal system. It is a member of the matlockite group. It was first described for an occurrence in the Constanicia mine, Tazna, Bolivia, in 1876. It was named for French mineralogist Gabriel Auguste Daubrée (1814–1896). At the Tanza location it occurs as a secondary mineral formed by the oxidation of native bismuth or bismuthinite. It occurs with clay minerals. In addition to its discovery location it has also been reported from the Tintic District in the East Tintic Mountains of Juab County, Utah; in the Josephine Creek District of Josephine County, Oregon; in the Manhattan District of Nye County, Nevada; and the Rio Marina Mine on Elba, Italy.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Daubréeite 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.
Daubréeite Localities Map
See where Daubréeite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Creamy-white, greyish, yellowish-brown; colourless in transmitted light.
- Hardness (Mohs)
- 2 - 2.5
- Density
- 7.7 g/cm³
Chemical Properties
- Chemical Formula
- (BiO)(OH,Cl)
- Elements
- Bi, Cl, H, O
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Daubréeite FAQs
How do I identify Daubréeite?
Daubréeite can be identified by its hardness of 2 - 2.5 on the Mohs scale, Creamy-white color. Look for these key characteristics when examining specimens.
What color is Daubréeite?
Daubréeite typically appears in Creamy-white, greyish, yellowish-brown; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Daubréeite?
Daubréeite has a hardness of 2 - 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
