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Långbanite, Langbanite

Year of discovery: 1877 (Långban, Sweden), 1986 (Japan)

Locality list: A locality of långbanite

• Mn₁₃SbSi₂O₂₄
• (Mn²⁺,Ca,Fe²⁺)₄(Mn³⁺,Fe³⁺)₉SbSi₂O₂₄
• [Mn²⁺₄][Mn³⁺₉][Sb⁵⁺][O₁₆|(SiO₄)₂]^40-

• Class: Nesosilicate - Oxide

• Color: Black
• Streak: Brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: Good on {0001} (1 plane)
• Hardness: 6.5
• Density: 4.9

• System: Trigonal, Monoclinic
• Group (Trigonal): 3m, P3m1
• Lattice (Trigonal): a=11.6, c=11.1
• Group (Monoclinic): 2/m, C2/m
• Lattice (Monoclinic): a=11.6, b=20.1, c=11.1, β=90.0