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Pseudomalachite

Year of discovery: 1813 (Virneberg mine (St Josephsberg mine), Germany), 1901 (Japan)

Locality list: 13 localities of pseudomalachite

• Cu₅(PO₄)₂(OH)₄
• [Cu²⁺₅][(OH)₄|(PO₄)₂]^10-

• Class: Phosphate - Hydroxide
• Soluble in: HCl, HNO₃, H₂SO₄

• Polymorph: Ludjibaite (Triclinic), Reichenbachite (Monoclinic)

• PO₄ => AsO₄: Cornwallite (Series), Cornubite

• Color: Bluish green, Dark green
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Imperfect on {010} (1 plane)
• Hardness: 4-4.5
• Density: 4.0

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=4.5, b=5.8, c=17.1, β=91.1

Etymology: Resemble appearance to Malachite.