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Hidalgoite

Year of discovery: 1953 (San Pascual mine, Mexico), 1981 (Japan)

Locality list: 3 localities of hidalgoite

• PbAl₃(AsO₄)(SO₄)(OH)₆
• [Pb²⁺][Al³⁺₃][(OH)₆|SO₄|AsO₄]^11-

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

• Al => Fe: Beudantite

• SO₄ => HAsO₄: Philipsbornite

• AsO₄ => PO₄: Hinsdalite, Orpheite

• (AsO₄)(SO₄) => (PO₄)(HPO₄): Plumbogummite

• Color: Gray, White, Pale green
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 4.5
• Density: 4.0

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.0, c=17.0