Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 Colour: Green, bluish green, blue, blackish blue to black, or brown and rarely yellow Lustre: Vitreous, Waxy, Earthy Hardness: 2½ – 3½ Specific Gravity: 1.93 – 2.4
Crystal System: Orthorhombic
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