General Information:
Chemical Formula:CaCu4(SO4)2(OH)6·3(H2O)
Composition:(Molecular Weight = 642.48 gm)Calcium 6.24 %
CaCopper 39.56 %
CuHydrogen 1.88 %
H Sulfur 9.98 %
S Oxygen 42.33 %
O Empirical Formula: CaCu4(OH)6(SO4)2·3(H2O)
IMA Status:Approved IMA 1960
Name Origin:Named after the French chemist, H. E. S. C. Deville (1818-1881). Named from its occurrence at Herrengrund, north of Neusohl, in Slovakia of Czechoslovakia.
Physical Properties: Cleavage:[001] Perfect, [110] Distinct
Color:blue, blue green, blue white, white, or dark green.
Density:3.1 - 3.13, Average = 3.11
Diaphaniety:Transparent
Habits:Spherical - Spherical, rounded aggregates., Platy - Sheet forms (e.g. micas)., Tabular - Form dimensions are thin in one direction.
Hardness:2.5 - Finger Nail
Luster:Vitreous - Pearly
Streak:light green
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