Arsenogorceixite Field of view: 5 mm Locality: Clara Mine, Oberwolfach, Baden-Württemberg, Germany — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0
Arsenogorceixite
Arsenogorceixite is an IMA-recognized mineral species in the arsenate class, with the chemical formula BaAl₃(AsO₄)(AsO₃OH)(OH)₆.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-crandallite structural group.
Key properties: Mohs hardness 4; specific gravity 3.65; Vitreous luster.
IMA symbol Agcx, IMA status: approved, named in 1989.
A rare secondary mineral found in the oxidized zone of a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).
It is found associated with Arsenogoyazite, brochantite, agardite, malachite, barian pharmacosiderite, olivenite, fluorite, barite, “limonite”, quartz (Clara mine, Germany); mimetite.
The name refers to its arsenic content and relation to gorceixite.