Boulangerite

A variety of Minerals

What is Boulangerite?

Boulangerite is a sulfosalt mineral, lead antimony sulfide, formula Pb5Sb4S11. It was named in 1837 in honor of French mining engineer Charles Boulanger (1810–1849). It forms metallic grey orthorhombic crystals. Sometimes the crystals form a fine feathery mass which has been called plumosite. Boulangerite is used as a lead ore.

Market Value Factors

Pricing varies for every rock and mineral, so use these universal factors to gauge Boulangerite 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.

Applies to all rocks & minerals.

Quick Facts

Physical Properties

Color: Lead grey
Hardness (Mohs): 2.5 - 3
Rock tumbling: Not recommended
Density: 6.21 g/cm³
Streak: Brownish

Chemical Properties

Chemical Formula: Pb₅Sb₄S₁₁
Elements: Pb, S, Sb

Also Known As

BoulangeriteBolideniteEpiboulangeriteOrlandinitePlumbostib

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Boulangerite FAQs

How do I identify Boulangerite?

Boulangerite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Lead grey color. Look for these key characteristics when examining specimens.

What color is Boulangerite?

Boulangerite typically appears in Lead grey. Color can vary depending on impurities and formation conditions.

How hard is Boulangerite?

Boulangerite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.