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Woodruffite

Year of discovery: 1953 (Passaic mine, USA), 1993 (Japan)

Locality list: A locality of woodruffite

• (Zn,Mn)Mn₅O₁₀,3.5H₂O
• (Zn,Mn)(Mn⁴⁺,Mn³⁺)₅O₁₀,3.5H₂O
• [Zn²⁺][Mn⁴⁺₃Mn³⁺₂][O₁₀]^20-,3.5H₂O

• Class: Oxide

• Color: Brown, Black
• Streak: Brown
• Luster: Earthy
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 4.5
• Density: 4.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=24.8, b=2.9, c=9.6, β=93.9