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Manganhumite

Year of discovery: 1978 (Brattfors mine, Sweden), 1982 (Japan)

Locality list: A locality of manganhumite

• Mn₇(SiO₄)₃(OH)₂
• (Mn,Mg)₇(SiO₄)₃(OH)₂
• [Mn²⁺₇][(OH)₂|(SiO₄)₃]^14-

• Class: Humite group
• Class: Nesosilicate - Hydroxide

• Polymorph: Leucophoenicite (Monoclinic)

• Mn => Ca: Chegemite

• Color: Brown, Pale brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 4
• Density: 3.8

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=10.5, b=21.5, c=4.8