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Trolleite

Year of discovery: 1868 (Västanå mine, Sweden), 1997 (Japan)

Locality list: A locality of trolleite

• Al₄(PO₄)₃(OH)₃
• [Al³⁺₄][(OH)₃|(PO₄)₃]^12-

• Class: Phosphate - Hydroxide
• Insoluble in: HCl, HNO₃, H₂SO₄

• Color: Colorless, Pale green, Bluish green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal pyramidal

• Cleavage: Indistinct (2 planes)
• Hardness: 5.5-6
• Density: 3.1

• System: Monoclinic
• Group: 2/m, B2/b
• Lattice: a=18.9, b=7.2, c=7.2, β=100.0