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Ludlockite

Year of discovery: 1970 (Tsumeb mine, Namibia), 2009 (Japan)

Locality list: A locality of ludlockite

• PbFe₄As₁₀O₂₂
• [Pb²⁺][Fe³⁺₄][As³⁺₁₀O₂₂]^14-

• Class: Arsenite

• Color: Orange
• Streak: Pale brown
• Luster: Resinous
• Diaphaneity: Translucent

• Cleavage: Perfect on {0-11} (1 plane), Good (? planes)
• Hardness: 1.5-2
• Density: 4.4

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=10.4, b=12.0, c=9.9, α=113.9, β=99.7, γ=82.7