Richelsdorfite Locality: Wilhelm Mine (Wechselschacht), Bauhaus, Richelsdorf District, North Hesse, Hesse, Germany Field of view 4 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Richelsdorfite
Richelsdorfite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Cu₅Sb⁵⁺(AsO₄)₄(OH)₆Cl·6H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 2; specific gravity 3.2; Vitreous luster; optically biaxial.
IMA symbol Rdf, IMA status: approved, named in 1982.
Found in cavities in sandstone in the Kupferschiefer (Richelsdorf Mountains, Germany).
It is found associated with Duftite, tyrolite, azurite, tetrahedrite–tennantite, calcite (Richelsdorf Mountains, Germany); tetrahedrite–tennantite, galena, brochantite, devilline.
The name refers to its first observed occurrence in the Richelsdorf Mountains, Germany.