Difference between revisions of "Azurite"
From The Gemology Project
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==Localities== | ==Localities== | ||
− | *dark blue almost black | + | *dark blue almost black crystals have come from Tsumbed (Namibia) and Morocco |
*Australia (Queensland), Chile, Mexico, Russia (Ural) and United states (Arizona, New Mexico) | *Australia (Queensland), Chile, Mexico, Russia (Ural) and United states (Arizona, New Mexico) | ||
==Sources== | ==Sources== | ||
* ''Gemstones of the world'' - Walter Schumann | * ''Gemstones of the world'' - Walter Schumann |
Revision as of 08:58, 30 July 2007
Azurite | |
---|---|
Chemical composition | Cu3(CO3)2(OH)2 |
Crystal system | Monoclinic |
Habit | Short columlar, botryoidal |
Cleavage | Indistinct |
Fracture | Conchoidal, uneven, brittle |
Hardness | 3 1/2 - 4 |
Optic nature | Biaxial + |
Refractive index | 1.720-1.848 |
Birefringence | 0.108-0.110 |
Specific gravity | 3.7-3.9 |
Lustre | Vitreous |
Pleochroism | Light blue, dark blue |
Azurite is named after its azure-blue color having a vitreous lustre.
Localities
- dark blue almost black crystals have come from Tsumbed (Namibia) and Morocco
- Australia (Queensland), Chile, Mexico, Russia (Ural) and United states (Arizona, New Mexico)
Sources
- Gemstones of the world - Walter Schumann