[ Top ] [ Japanese ]

Goyazite

Year of discovery: 1884 (Diamantina, Brazil), 1990 (Japan)

Locality list: 4 localities of goyazite

• SrAl₃(PO₄)₂(OH)₅,H₂O
• [Sr²⁺][Al³⁺₃][(OH)₆|PO₄|HPO₄]^11-

• Class: Plumbogummite group < Alunite supergroup
• Class: Phosphate - Hydroxide - Hydrate
• Soluble in: HCl (Slowly), HNO₃ (Slowly), H₂SO₄ (Slowly)

• Sr => Ca: Crandallite (Series)
• Sr => Ba: Gorceixite (Series)
• Sr => Pb: Plumbogummite

• PO₄ => AsO₄: Arsenogoyazite

• HPO₄ => SO₄: Svanbergite

• Color: White, Yellow
• Streak: White
• Luster: Resinous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 4.5-5
• Density: 3.3

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.0, c=16.6