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Tochilinite

Year of discovery: 1971 (Nizhnii Mamon deposit, Russia), 1978 (Japan)

Locality list: 3 localities of tochilinite

• Fe_5.4Mg₅S₆(OH)₁₀
• Fe_5.4(Mg,Fe)₅S₆(OH)₁₀
• 6[Fe²⁺_0.9][S]^2-,5[Mg²⁺][(OH)₂]^2-

• Class: Sulfide - Hydroxide
• Magnetism: Paramagnetic

• Fe => (Fe,Ni): Haapalaite
• Fe => (Fe,Cu): Valleriite
• Fe => V_0.5: Yushkinite

• Mg => Fe: Ferrotochilinite

• Color: Dark yellowish brown, Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular, Foliated
• Aggregate: Radial, Felted

• Cleavage: Distinct on {001} (1 plane)
• Density: 3.0

• System: Monoclinic
• Group: 2, m, or 2/m, P2, Pm, or P2/m
• Lattice: a=5.4, b=15.5, c=10.9, β=94.8

Etymology: Professor Mitrofan Stepanovich Tochilin, Russian mineralogist