baumhauerite

Baumhauerite (Pb3As4S9) is a rare lead sulfosalt mineral. It crystallizes in the triclinic system, is gray-black to blue-gray and its lustre is metallic to dull. Baumhauerite has a hardness of 3.

Key facts

Mineral.name: Baumhauerite
Mineral.category: Sulfosalt mineral
Mineral.image: Baumhauerite-177525.jpg
Mineral.caption: Baumhauerite from Lengenbach Quarry, Im Feld, Binn Valley, Wallis, Switzerland
Mineral.formula: Pb3As4S9
Mineral.IMAsymbol: Bha
Mineral.strunz: 2.HC.05b
Mineral.system: Triclinic
Mineral.class: Pedial (1) (same H-M symbol)
Mineral.symmetry: P1
Mineral.color: Gray-black to blue-gray
Mineral.twinning: Polysynthetic, on [100]
Mineral.cleavage: Perfect on [100]
Mineral.fracture: Conchoidal
Mineral.mohs: 3
Mineral.luster: Metallic to dull
Mineral.streak: chocolate brown
Mineral.gravity: 5.33

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Wikidata facts

Image: Baumhauerite-177525.jpg

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IMA Mineral Symbol: Bha
Nickel-Strunz 9th edition (updated 2009): 2.HC.05b
Commons category: Baumhauerite
Strunz 8th edition (series ID, updated): II/D.06
chemical formula: Pb₁₂As₁₆S₃₆
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 2.HC.05b

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Baumhauerite (Pb3As4S9) is a rare lead sulfosalt mineral. It crystallizes in the triclinic system, is gray-black to blue-gray and its lustre is metallic to dull. Baumhauerite has a hardness of 3.

Baumhauerite occurs as small crystals embedded in dolomitic marble. It is found primarily in the Lengenbach Quarry, Binnental, in the Valais region of Switzerland, the mineral is named after German mineralogist Heinrich Adolph Baumhauer (1848–1926), who discovered it at Lengenbach, famous among mineralogists for its array of rare minerals, in 1902. Baumhauerite has also been reported at Sterling Hill, New Jersey, United States, typically in association with molybdenite, and in aggregates at Hemlo, Thunder Bay, Ontario, Canada.