General Information:
Chemical Formula:
Cu2Cl(OH)3
Composition:
(Molecular Weight = 213.57 gm)
Copper 59.51 % Cu
Hydrogen 1.42 % H
Chlorine 16.60 % Cl
Oxygen 22.47 % O
Empirical Formula:
Cu2Cl(OH)3
Environment:
Arid climates with oxidizable copper minerals.
Locality:
Atacam desert province in northern Chile.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[010] Perfect
Color:
green, yellow, yellow green, or black green.
Density:
3.76 - 3.78, Average = 3.76
Diaphaniety:
Transparent to translucent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Fibrous - Crystals made up of fibers., Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
None.
Luster:
Adamantine
Streak:
apple green
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