General Information:
Chemical Formula:
Fe++Fe+++4(SO4)6(OH)2·20(H2O)
Composition:
(Molecular Weight = 1,182.36 gm)
Magnesium 2.06 % Mg
Iron 18.89 % Fe
Hydrogen 3.24 % H
Sulfur 16.27 % S
Oxygen 59.54 % O
Empirical Formula:
MgFe3+4(SO4)6(OH)2·18(H2O)
Environment:
Oxidized iron sulfide deposits.
Locality:
Copiapo, Chile.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[010] Perfect
Color:
green, green yellow, yellow, yellow green, or golden yellow.
Density:
2.1
Diaphaniety:
Translucent
Habits:
Scaly - Morphology like fish scales., Massive - Granular - Common texture observed in granite and other igneous rock., Encrustations - Forms crust-like aggregates on matrix.
Hardness:
2.5 - Finger Nail
Luminescence:
None.
Luster:
Pearly
Streak:
pale yellow
More details...