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Cornubite

Year of discovery: 1958 (Wheal Carpenter, UK), 1962 (Japan)

Locality list: 6 localities of cornubite

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

• Class: Arsenate - Hydroxide

• Polymorph: Cornwallite (Monoclinic)

• AsO₄ => PO₄: Pseudomalachite, Ludjibaite, Reichenbachite

• Color: Green, Dark green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect (2 planes, 70 degree)
• Hardness: 4
• Density: 4.6

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=6.1, b=6.3, c=6.8, α=92.9, β=111.3, γ=107.4