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Dominant species
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Chalcanthite
Chemical
Formula
CuSO4·5H2O
Species
Sulfates
Crystal
System
Triclinic
Mohs
Scale
2
Specific
Gravity
2.12-2.3
Color
Berlin blue to sky-blue, greenish blue
Streak
White
Luster
Vitreous, Resinous
Refractive
Index
n = 1.514 n = 1.537 n = 1.543
Diaphaneity
Transparent, Translucent
Cleavage
Imperfect/FairImperfect on , Indistinct on ; and, in traces.
Fracture
Conchoidal
Crystal Habit:Typically stalactitic, encrusted, reniform or massive. Natural crystals are rare, but are short prismatic or tabular
Geological Setting:Found in the oxidized zones of copper deposits, usually in arid regions where it is not dissolved by ground water. Commonly associated with other hydrated sulphates of Cu or Fe.
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