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Crednerite

Year of discovery: 1849 (Glücksstern mine, Germany), 1975 (Japan)

Locality list: 3 localities of crednerite

• CuMnO₂
• [Cu²⁺][Mn²⁺][O₂]^4-

• Class: Oxide

• Cu => Mn: Tenorite
• Cu => Cr: Mcconnellite
• Cu => Fe: Delafossite

• Mn => Cu: Manganosite

• Color: Black
• Streak: Brownish black
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: Perfect on {001}, {100}, {111} (3 planes)
• Hardness: 4
• Density: 5.0

• System: Monoclinic
• Group: 2/m, A2/m
• Lattice: a=5.6, b=2.9, c=5.9, β=104.0