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Rockbridgeite

Year of discovery: 1949 (Midvale mine, USA), 1980 (Japan)

Locality list: 5 localities of rockbridgeite

• Fe₅(PO₄)₃(OH)₅
• (Fe,Mn)Fe₄(PO₄)₃(OH)₅
• [Fe²⁺][Fe³⁺₄][(OH)₅|(PO₄)₃]^14-

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

• Fe²⁺ => Mn: Frondelite (Series)
• Fe²⁺ => Zn: Plimerite

• Color: Dark green, Grayish green, Yellowish brown
• Tarnish: Brown (by oxidation)
• Streak: Greenish gray
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 plane), Good on {010} (1 plane), Distinct on {001} (1 plane)
• Hardness: 3.5-4.5
• Density: 3.5

• System: Orthorhomobic
• Group: mmm, Bbmm
• Lattice: a=13.8, b=16.8, c=5.2