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Abswurmbachite

Year of discovery: 1991 (Greece), 2000 (Japan)

Locality list: A locality of abswurmbachite

• CuMn₆SiO₁₂
• (Cu,Mn)(Mn,Fe,Al)₆SiO₁₂
• [Cu²⁺][Mn³⁺₆][O₈|SiO₄]^20-

• Class: Humite group
• Class: Nesosilicate - Oxide

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

• Color: Black
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 6.5
• Density: 5.0

• System: Tetragonal
• Group: 4/mmm, I4₁/acd
• Lattice: a=9.4, c=18.5

Etymology: Dr. Irmgard Abs-Wurmback (1938-), German mineralogist of Ruhr Univ., Germany