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Plumbogummite

Year of discovery: 1819 (Huelgoat (Locmaria-Berrien), France), 1974 (Japan)

Locality list: 9 localities of plumbogummite

• PbAl₃(PO₄)₂(OH)₅,H₂O
• [Pb²⁺][Al³⁺₃][(OH)₆|PO₄|HPO₄]^11-

• Class: Plumbogummite group < Alunite supergroup
• Class: Phosphate - Hydroxide
• Soluble in: hot HCl, hot HNO₃, hot H₂SO₄
• Substitution pseudomorph: Replace Pyromorphite or Baryte.

• Pb => Ca: Crandallite
• Pb => Ba: Gorceixite
• Pb => Sr: Goyazite

• Al => Fe: Kintoreite
• Al => Ga: Galloplumbogummite

• HPO₄ => SO₄: Hinsdalite (Series), Orpheite

• PO₄ => AsO₄: Philipsbornite
• (PO₄)(HPO₄) => (AsO₄)(SO₄): Hidalgoite

• Color: Pale blue, Gray, Yellowish brown
• Streak: White
• Luster: Resinous
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 4-5
• Density: 4.0

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.0, c=16.7