Arsenbrackebuschite
Arsenbrackebuschite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Pb₂(Fe³⁺,Zn)(AsO₄)₂(OH,H₂O).
It crystallizes in the monoclinic crystal system (space group P2_1/m). It is a member of the Brackebuschite structural group.
Key properties: Mohs hardness 4–5; specific gravity 6.54; Pale brownish streak; Resinous to adamantine luster; optically biaxial.
IMA symbol Abbs, IMA status: approved, named in 1977.
Found in fissures in dolomite breccia in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit (Tsumeb, Namibia); in a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).
It is found associated with Beudantite, anglesite, mimetite, bayldonite, stolzite (Clara mine, Germany).
As the arsenate analog of brackebuschite.