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Frondelite

Year of discovery: 1949 (Sapucaia mine (Proberil mine), Brazil), 1996 (Japan)

Locality list: A locality of frondelite

• MnFe₄(PO₄)₃(OH)₅
• (Mn,Fe)Fe₄(PO₄)₃(OH)₅
• [Mn²⁺][Fe³⁺₄][(OH)₅|(PO₄)₃]^14-

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

• Mn => Zn: Plimerite
• Mn => Fe: Rockbridgeite (Series)

• Color: Dark green, Dark brown
• Streak: Green, Brown
• Luster: Vitreous
• Diaphaneity: Translucent

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

• System: Orthorhombic
• Group: 222, C222₁
• Lattice: a=13.8, b=17.0, c=5.2