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Crandallite

Year of discovery: 1917 (Brooklyn mine, USA), 1985 (Japan)

Locality list: 8 localities of crandallite

• CaAl₃(PO₄)₂(OH)₅,H₂O
• [Ca²⁺][Al³⁺₃][(OH)₆|PO₄|HPO₄]^11-

• Class: Plumbogummite group < Alunite supergroup
• Class: Phosphate - Hydroxide - Hydrate
• Soluble in: HCl (Difficult)
• Substitution pseudomorph: Replace Gordonite.

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

• PO₄ => AsO₄: Arsenocrandallite

• HPO₄ => SO₄: Woodhouseite

• Color: Yellow, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect on {0001} (1 planes)
• Hardness: 5
• Density: 2.8

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=7.0, c=16.2