Ktenasite

IMA formula: ZnCu₄(SO₄)₂(OH)₆(H₂O)₆

Crystallography: Monoclinic. P2₁/c. a = 5.598 (3) Å, b = 6.121 (4) Å, c = 23.762 (15) Å, β = 95.55 (6)°. Z = 2.