Chalcanthite

IMA formula: Cu(SO₄)(H₂O)₄·H₂O

Crystallography: Triclinic. P-1. a = 5.9676(2) Å, b = 6.0957(2) Å, c = 10.6366(3) Å, α = 77.224(3) °, β = 82.387(2) Å, γ = 72.434(3) Å. Ζ = 2.