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Chalcophyllite

Year of discovery: 1847 (World), 1916 (Japan)

Locality list: 4 localities of chalcophyllite

• Cu₁₈Al₂(AsO₄)₃(SO₄)₃(OH)₂₇,33H₂O
• [Cu²⁺₁₈][Al³⁺₂][(OH)₂₇|(SO₄)₃|(AsO₄)₃]^42-,33H₂O

• Class: Arsenate - Sulfate - Hydroxide - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄, NH₃aq
• Amount of bound water changes depending on humidity by dehydration.
• Alter to Chrysocolla.
• Substitution pseudomorph: Replaced by Malachite.

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

• Habit: Hexagonal platy

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2
• Density: 2.7

• System: Trigonal
• Group: (-3), R(-3)
• Lattice: a=10.8, c=28.7

Etymology: Khalkos (copper) - phyllon (leaf) in Greek after its platy shape.