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Phosphosiderite

Year of discovery: 1890 (Kalterborn mine, Germany), 1982 (Japan)

Locality list: 4 localities of phosphosiderite

• FePO₄,2H₂O
• [Fe³⁺][PO₄]^3-,2H₂O

• Class: Phosphate - Hydrate
• Soluble in: HCl
• Insoluble in: HNO₃

• Polymorph: Strengite (Orthorhombic)

• Fe => Al: Variscite, Metavariscite
• Fe => Sc: Kolbeckite

• PO₄ => AsO₄: Scorodite

• Color: Purple, Reddish brown, Yellowish brown, Greenish gray
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {010} (1 plane), Indistinct on {001} (1 plane)
• Hardness: 3.5-4
• Density: 2.8

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=5.3, b=9.8, c=8.7, β=90.5

Synonym: Clinostrengite