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Chalcanthite

Year of discovery: 1826 (Chuquicamata mine, Chile), 1894 (Japan)

Locality list: 57 localities of chalcanthite

• CuSO₄,5H₂O
• [Cu(H₂O)₄]²⁺[SO₄]^2-,H₂O

• Class: Chalcanthite group
• Class: Sulfate - Hydrate
• Soluble in: Water
• Insoluble in: HCl
• Dehydrate to powder.
• Formed on dehydration of Boothite.
• Formed at pH 3.5-4.0. Antlerite is stable more than pH 4.0.
• Chalcocite is formed at the more reductive condition.

• Cu => Mn: Jôkokuite (Jokokuite)
• Cu => Mg: Pentahydrite
• Cu => Fe: Siderotil

• 5H₂O => H₂O: Poitevinite
• 5H₂O => 3H₂O: Bonattite
• 5H₂O => 7H₂O: Boothite

• Color: Blue-Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Thick tabular
• Aggregate: Stalactic

• Cleavage: Indistinct on {110}{111} (2 planes)
• Hardness: 2.5
• Density: 2.3

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=6.1, b=10.7, c=6.0, α=97.6, β=107.2, γ=77.6