Chalcanthite

General Information: Chemical Formula:CuSO4·5(H2O) Composition:(Molecular Weight = 249.69 gm)Copper 25.45 % CuHydrogen 4.04 % H Sulfur 12.84 % S Oxygen 57.67 % O  Empirical Formula: Cu(SO4)·5(H2O) Environment:Secondary, formed in arid climates or in rapidly oxidizing copper deposits. Locality:Walls and timbers of copper mines. Name Origin:From the Greek chalkos, "copper" and anthos, "flower." Generally pysdomorphous after Boothite.Physical Properties: Cleavage:[110] Imperfect, [110] Indistinct, [111] Indistinct Color:green, green blue, light blue, or dark blue. Density:2.12 - 2.3, Average = 2.21 Diaphaniety:Subtransparent to translucent Habits:Encrustations - Forms crust-like aggregates on matrix., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., Reniform - "Kidney like" in shape (e.g .. hematite). Hardness:2.5 - Finger Nail Luminescence:None. Luster:Vitreous (Glassy) Streak:whiteMore details...