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Laihunite

Year of discovery: 1976 (Laihe deposit, Chine), 1984 (Japan)

Locality list: 7 localities of laihunite

• Fe₃(SiO₄)₂
• [Fe²⁺][Fe³⁺₂][(SiO₄)₂]^8-

• Class: Olivine group
• Class: Nesosilicate
• Magnetism: Paramagnetic
• Formed by oxidation of Fayalite.
• Substitution pseudomorph: Replace Fayalite.

• SiO₄ => PO₄: Sarcopside

• Color: Dark brown
• Streak: Pale brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: Perfect on {100}, {010}, and {001} (3 planes)
• Hardness: 6
• Density: 3.9

• System: Orthorhombic (3O), Monoclinic (1M, 2M) (Layer-stacking polytype)
• Group: 2/m, Pbnm, P2/b, P2₁/b
• Lattice: a=4.8, b=10.2, c=5.8, β=90.0