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Beraunite

Year of discovery: 1841 (Hrbek mine, Czech), 1980 (Japan)

Locality list: 5 localities of beraunite

• Fe₆(PO₄)₄(OH)₅,4H₂O
• Fe²⁺Fe³⁺₅(PO₄)₄(OH)₅,4H₂O
• [Fe²⁺][Fe³⁺₅][(OH)₅|(PO₄)₄]^17-,4H₂O

• Class: Phosphate - Hydroxide - Hydrate
• Soluble in: HCl
• Alter to Limonite.
• Alter to Vivianite.

• Color: Dark brown-Green
• Tarnish: Red (by oxidation)
• Streak: Green-Yellow
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 3-4
• Density: 2.9

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=21.0, b=5.2, c=19.3, β=93.3