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Hisingerite

Year of discovery: 1828 (Riddarhyttan, Sweden), 1934 (Japan)

Locality list: 41 localities of hisingerite

• Fe₂Si₂O₅(OH)₄,2H₂O
• [Fe³⁺₂][(OH)₄|Si₂O₅]^6-,2H₂O

• Class: Allophane group
• Class: Phyllosilicate - Hydroxide - Hydrate
• Variety: Sturtite

• Fe => Zn: Zinalsite

• Color: Black, Dark brown
• Streak: Yellowish brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 2.5-3
• Density: 2.5

• System: Monoclinic
• Lattice: a=5.4, b=9.0, c=15.0, β=98.3