Caledonite

General Information: Chemical Formula:Pb5Cu2(CO3)(SO4)3(OH)6 Composition:(Molecular Weight = 1,613.34 gm)Copper 7.88 % CuHydrogen 0.37 % H Lead 64.21 % PbCarbon 0.74 % C Sulfur 5.96 % S Oxygen 20.83 % O  Empirical Formula: Pb5Cu2(CO3)(SO4)3(OH)6 Environment:Secondary, weathered zone of lead and copper ores. Locality:Mammoth Mine at Tiger, Arizona. Name Origin:Named after Caledonia, the historical name of Scotland.Physical Properties: Cleavage:[001] Perfect, [100] Distinct Color:blue, blue green, green, or dark green. Density:5.7 - 6.4, Average = 6.05 Diaphaniety:Transparent to Translucent Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Striated - Parallel lines on crystal surface or cleavage face. Hardness:2.5-3 - Finger Nail-Calcite Luminescence:None. Luster:Vitreous - Greasy Streak:greenish whiteMore details...