![Lapis Lazuli (in jewelry setting) (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)) — metamorphic](https://media.rock.id/lapis-lazuli-in-jewelry-setting-a4e052a7-f5f3-400e-bd4d-dfb78faa18ce-compressed.jpg)
metamorphic
Lapis Lazuli (in jewelry setting)
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)
Hardness: 5-5.5 (Mohs scale), Color: Intense deep blue, Luster: Vitreous to greasy, Structure: Crystalline (primarily Lazurite), Cleavage: Poor, Specific Gravity: 2.7-2.9.
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.5 (Mohs scale), Color: Intense deep blue, Luster: Vitreous to greasy, Structure: Crystalline (primarily Lazurite), Cleavage: Poor, Specific Gravity: 2.7-2.9.
Formation & geological history
Formed through contact metamorphism, where limestone or marble is altered by hydrothermal processes. Typically found in deposits from the Neoproterozoic to recent eras, often associated with pyrite and calcite.
Uses & applications
Primary use is in jewelry as a gemstone, ornamental carvings, and historically as the pigment ultramarine for fine arts.
Geological facts
Lapis lazuli has been mined for over 6,500 years. The most famous mines are in Sar-e-Sang, Afghanistan. It was highly prized by ancient Egyptians and used for the funeral mask of Tutankhamun.
Field identification & locations
Field identification is based on its distinct deep blue color and the presence of golden pyrite flecks. It is common in metaphysical markets and found primarily in Afghanistan, Chile, and Russia.
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