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Huangite

Year of discovery: 1992 (Tambo mine, Chile), 1998 (Japan)

Locality list: 4 localities of huangite

• Ca_0.5Al₃(SO₄)₂(OH)₆
• [Ca²⁺[]][Al³⁺₆][(OH)₁₂|(SO₄)₄]^20-

• Class: Alunite group < Alunite supergroup
• Class: Sulfate - Hydroxide

• Ca => Ba: Walthierite

• Ca_0.5 => K: Alunite
• Ca_0.5 => Na: Natroalunite, Natroalunite-2c
• Ca_0.5 => NH₄: Ammonioalunite

• Color: White, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect
• Hardness: 3-4

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.0, c=33.5