Boulangerite

Boulangerite is a sulfosalt mineral, lead antimony sulfide, formula Pb₅Sb₄S₁₁. It was named in 1837 in honor of French mining engineer Charles Boulanger. 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.

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