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Chalcophanite

Year of discovery: 1875 (Marshall mine (Passaic mine), USA), 1963 (Japan)

Locality list: 6 localities of chalcophanite

• ZnMn₃O₇,3H₂O
• (Zn,Fe²⁺,Mn²⁺)Mn⁴⁺₃O₇,3H₂O
• [Zn²⁺][Mn⁴⁺₃][O₇]^14-,3H₂O

• Class: Chalcophanite group
• Class: Oxide - Hydrate

• Zn => Mn: Aurorite

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

• Cleavage: Perfect on {0001} (1 planes)
• Hardness: 2.5
• Density: 4.0

• System: Trigonal
• Group: (-3), R(-3)
• Lattice: a=7.5, c=20.8