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Neltnerite

Year of discovery: 1979 (Tachgagalt mine, Morocco), 1992 (Japan)

Locality list: A locality of neltnerite

• CaMn₆SiO₁₂
• [Ca²⁺][Mn³⁺₆][O₈|SiO₄]^20-

• Class: Humite group
• Class: Nesosilicate - Oxide

• Ca => Cu: Abswurmbachite
• Ca => Mn: Braunite

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

• Cleavage: Poor
• Hardness: 6

• System: Tetragonal
• Lattice: a=9.5, c=18.9