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Dufrénite, Dufrenite

Year of discovery: 1833 (Anglar, France, and Hoff auf mich mine, Germany), 1964 (Japan)

Locality list: 2 localities of dufrénite

• Ca_0.5Fe₆(PO₄)₄(OH)₆,2H₂O
• [Ca²⁺_0.5][Fe²⁺][Fe³⁺₅][(OH)₆|(PO₄)₄]^18-,2H₂O

• Class: Phosphate - Hydroxide - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄

• Ca_0.5 => Na: Natrodufrénite

• Color: Dark green
• Streak: Green
• Luster: Resinous-Silky
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect (1 plane), Good (1 plane), both parallel to crystal elongation
• Hardness: 3.5-4.5
• Density: 3.3

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=25.8, b=5.1, c=13.8, β=111.2