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Cornwallite (Photo)

Year of discovery: 1846 (Wheal Gorland, UK), 1991 (Japan)

Locality list: 6 localities of cornwallite

• Cu₅(AsO₄)₂(OH)₄
• [Cu²⁺₅][(OH)₄|(AsO₄)₂]^10-

• Class: Arsenate - Hydroxide
• Soluble in: HNO₃

• Polymorph: Cornubite (Triclinic)

• AsO₄ => PO₄: Pseudomalachite (Series), Ludjibaite, Reichenbachite

• Color: Green
• Streak: Green
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect (1 plane)
• Hardness: 4.5
• Density: 4.2

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=17.3, b=5.8, c=4.6, β=92.2