copper sulfate 5-hydrate
occurs in nature as mineral chalcanthite
triclinic pinacoidal
this crystal shows 10 faces
pinacoid {010}      d = 0.800   2 faces
pinacoid {011}      d = 2.200   2 faces
pinacoid {-101}      d = 1.000   2 faces
pinacoid {120}      d = 1.200   2 faces
pinacoid {-120}      d = 1.200   2 faces
unit cell :  a = 6.12  b = 10.69  c = 5.96
α = 97.58 (alpha)
β = 107.17 (beta)
γ = 77.55 (gamma)