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Cumengeite

Year of discovery: 1893 (Santa Bosalía (El Boleo), Mexico), 2015 (Japan)

Locality list: A locality of cumengeite

• Pb₂₁Cu₂₀Cl₄₂(OH)₄₀,6H₂O
• [Pb²⁺₂₁][Cu²⁺20][(OH)₄₀|Cl₄₂]^82-,6H₂O

• Class: Chloride - Hydroxide - Hydrate
• Soluble in: HNO₃

• Color: Sky blue
• Streak: Blue
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {101} (4 planes), Distinct on {110} (2 planes), Poor on {001} (1 plane)
• Hardness: 2.5
• Density: 4.7

• System: Tetragonal
• Group: 4/mmm, I4/mmm
• Lattice: a=15.1, c=24.4