General Information:
Chemical Formula:Cu4(SO4)(OH)6·2(H2O)
Composition:(Molecular Weight = 372.75 gm)Copper 51.14 %
CuHydrogen 1.62 %
H Sulfur 8.60 %
S Oxygen 38.63 %
O Empirical Formula: Cu3(SO4)(OH)4·(H2O)
Name Origin:Named after the Viennese physicist, V. von Lang (1838-1921).
Physical Properties: Cleavage:[001] Perfect, [010] Distinct
Color:blue green, green blue, or sky blue.
Density:3.5
Diaphaniety:Translucent
Habits:Concretionary - Rounded massive fine-grained materials., Fibrous - Crystals made up of fibers., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite) .
Hardness:2.5-3 - Finger Nail-Calcite
Luster:Vitreous (Glassy)
Streak:greenish blue
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