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Torbernite
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Torbernite, also known as chalcolite, is a relatively common mineral with the chemical formula Cu₂(H₂O)₁₂. It is a radioactive, hydrated green copper uranyl phosphate, found in granites and other uranium-bearing deposits as a secondary mineral. Wikipedia
Color: Emerald green to apple green
Crystal class: Ditetragonal dipyramidal (4/mmm); H-M symbol: (4/m 2/m 2/m)
Crystal habit: Tabular crystals; Foliated to earthy masses and encrustations
Crystal system: Tetragonal
Density: measured: 3.22; calculated: 3.264(1)
Formula (repeating unit): Cu2(H2O)12
Fracture: Brittle