General Information:
Chemical Formula:
Cu3(CO3)2(OH)2
Composition:
(Molecular Weight = 344.67 gm)
Copper 55.31 % Cu
Hydrogen 0.58 % H
Carbon 6.97 % C
Oxygen 37.14 % O
Empirical Formula:
Cu3(CO3)2(OH)2
Environment:
Secondary mineral in the oxidized zone of copper ore deposits.
IMA Status:
Accepted IMA 1980
Locality:
Tsumeb near Otavi, Namibia.
Name Origin:
From the Persian lazhward, meaning "blue.".
Physical Properties:
Cleavage:
[011] Perfect, [100] Fair
Color:
azure blue, blue, light blue, or dark blue.
Density:
3.77 - 3.89, Average = 3.83
Diaphaniety:
Transparent to subtranslucent
Habits:
Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Stalactitic - Shaped like pendant columns as stalactites or s talagmites (e.g. calcite).
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
light blue
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