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Aurorite

Year of discovery: 1967 (North Aurora mine, USA), 1981 (Japan)

Locality list: A locality of aurorite

• Mn₄O₇,3H₂O
• (Mn²⁺,Ag,Ca)Mn⁴⁺₃O₇,3H₂O
• [Mn²⁺][Mn⁴⁺₃][O₇]^14-,3H₂O

• Class: Chalcophanite group
• Class: Oxide - Hydrate

• Mn => Zn: Chalcophanite

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

• Cleavage: Perfect (1 plane)
• Hardness: 2-3
• Density: 4.0

• System: Trigonal
• Lattice: a=7.5, c=20.7