Devilline

General Information:
 Chemical Formula:
CaCu4(SO4)2(OH)6·3(H2O)
 Composition:
(Molecular Weight = 642.48 gm)
Calcium 6.24 % Ca
Copper 39.56 % Cu
Hydrogen 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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