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Beudantite

Year of discovery: 1826 (Louise mine, Germany), 1977 (Japan)

Locality list: 18 localities of beudantite

• PbFe³⁺₃(AsO₄)(SO₄)(OH)₆
• Pb(Fe,Sb)₃(AsO₄,PO₄,SO₄)(SO₄,AsO₄)(OH)₆
• [Pb²⁺][Fe³⁺₃][(OH)₆|SO₄|AsO₄]^11-

• Class: Beudantite group < Alunite supergroup
• Class: Arsenate - Sulfate - Hydroxide
• Soluble in: HCl

• Fe => Al: Hidalgoite

• SO₄ => AsO₄: Segnitite (Series)

• AsO₄ => PO₄: Corkite (Series)

• Pb_0.5AsO₄ => SO₄: Plumbojarosite (Series)

• Color: Black, Dark green, Dark brown
• Streak: Brown-Green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Rhombohedral

• Cleavage: Good on {0001} (1 plane)
• Hardness: 3.5-4.5
• Density: 4.5

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.3, c=17.0