Bariopharmacoalumite
Bariopharmacoalumite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ba₀.₅Al₄[(AsO₄)₃(OH)₄]·4H₂O.
It crystallizes in the cubic crystal system (space group P-43m). It is a member of the Pharmacosiderite structural group.
Key properties: Mohs hardness 3.5; specific gravity 2.58; White streak; Adamantine luster.
IMA symbol Bpal, IMA status: approved, named in 2010.
A secondary mineral coating fractures and cavities in tetrahedrite-tennantite bearing rocks undergoing near-surface weathering.
It is found associated with Mansfieldite, philipsbornite, beudantite, carminite, duftite, mimetite, scorodite, olivenite, arsentsumebite, lavendulan, foretite (Cap Garonne mines, France).
Recognizes the species as the barium dominant analogue of pharmacoalumite.