General Information:
Chemical Formula:
Cu2(CO3)(OH)2
Composition:
(Molecular Weight = 221.12 gm)
Copper 57.48 % Cu
Hydrogen 0.91 % H
Carbon 5.43 % C
Oxygen 36.18 % O
Empirical Formula:
Cu2(CO3)(OH)2
Environment:
Secondary mineral in the oxidized zones of copper ore deposits.
IMA Status:
Approved IMA 1962
Locality:
Nizhne-Taglisk, Ural Mountains, Russia.
Name Origin:
From the Greek, malache, - "mallow" in reference to green leaf color.
Physical Properties:
Cleavage:
[201] Perfect, [010] Fair
Color:
green, dark green, or blackish green.
Density:
3.6 - 4, Average = 3.8
Diaphaniety:
Translucent to subtranslucent to opaque
Habits:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., Massive - Fibrous - Distinctly fib rous fine-grained forms.
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Vitreous - Silky
Streak:
light green
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