Baumhauerite (Pb3As4S9) is a rare lead sulfosalt mineral 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. It is found primarily in the Lengenbach Quarry , in the Valais, 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 , typically in association with molybdenite , and in aggregates at Hemlo, Thunder Bay.