Cyanotrichite

IMA formula: Cu₄Al₂(SO₄)(OH)₁₂(H₂O)₂

Crystallography: Monoclinic. C2/m. a = 12.625(3) Å, b = 2.8950(6) Å, c = 10.153(2) Å, β = 92.17(3)°. Z = 1.