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Strengite

Year of discovery: 1877 (Eleonore mine, Germany), 1947 (Japan)

Locality list: 6 localities of strengite

• FePO₄,2H₂O
• [Fe³⁺][PO₄]^3-,2H₂O

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

• Polymorph: Phosphosiderite (Monoclinic)

• Fe => Al: Variscite (Series), Metavariscite
• Fe => Sc: Kolbeckite

• PO₄ => AsO₄: Scorodite

• Color: Purple, Pink, Pale green, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

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

• System: Orthorhombic
• Group: mmm, Pbca
• Lattice: a=8.7, b=9.9, c=10.1