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Baumhauerite from Lengenbach Quarry, Im Feld, Binn Valley, Wallis, Switzerland
Category Sulfosalt mineral
(repeating unit)
Strunz classification 2.HC.05b
Crystal system Triclinic
Crystal class Pedial (1)
(same H-M symbol)
Space group P1
Color Gray-black to blue-gray
Twinning Polysynthetic, on [100]
Cleavage Perfect on [100]
Fracture Conchoidal
Mohs scale hardness 3
Luster Metallic to dull
Streak chocolate brown
Specific gravity 5.33
References [1][2][3]

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 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.