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Bariopharmacosiderite

Year of discovery: 1990 (Clara mine, Germany), 1994 (Japan)

Locality list: 3 localities of bariopharmacosiderite

• Ba_0.5Fe₄(AsO₄)₃(OH)₄,5H₂O
• [Ba²⁺_0.5][Fe³⁺₄][(OH)₄|(AsO₄)₃]^13-,5H₂O

• Class: Pharmacosiderite group
• Class: Arsenate - Hydroxide - Hydrate

• Polymorph: Bariopharmacosiderite-C (Cubic), Bariopharmacosiderite-Q (Tetragonal)

• Ba_0.5 => K: Pharmacosiderite
• Ba_0.5 => Na: Natropharmacosiderite
• Ba_0.5 => H₃O: Hydroniumharmacosiderite

• Fe => Al: Bariopharmacoalunite

• Color: Brown-Yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {100} (2 planes), Good on {001} (1 plane)
• Hardness: 2.5
• Density: 3.1

• System: Tetragonal
• Group: (-4)2m, P(-4)2m
• Lattice: a=8.0, c=8.1