Berthierite
A variety of Minerals
What is Berthierite?
Berthierite is a mineral, a sulfide of iron and antimony with formula FeSb2S4. It is steel grey in colour with a metallic lustre which can be covered by an iridescent tarnish. Because of its appearance it is often mistaken for stibnite. It was discovered in France in 1827 and named for the French chemist, Pierre Berthier (1782–1861).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Berthierite 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.
Berthierite Localities Map
See where Berthierite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Dark steel-grey, often with iridescent tarnish.
- Hardness (Mohs)
- 2 - 3
- Density
- 4.66 g/cm³
- Streak
- Dark brownish-grey.
Chemical Properties
- Chemical Formula
- FeSb2S4
- Elements
- Fe, S, Sb
Also Known As
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Berthierite FAQs
How do I identify Berthierite?
Berthierite can be identified by its hardness of 2 - 3 on the Mohs scale, Dark steel-grey color. Look for these key characteristics when examining specimens.
What color is Berthierite?
Berthierite typically appears in Dark steel-grey, often with iridescent tarnish.. Color can vary depending on impurities and formation conditions.
How hard is Berthierite?
Berthierite has a hardness of 2 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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