![Lapis Lazuli (polished cabochon/sphere) (Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)) — metamorphic](https://media.rockidentification.com/12c54984-1bb0-4471-80fb-c40148c23c45-compressed.jpg)
metamorphic
Lapis Lazuli (polished cabochon/sphere)
Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)
Hardness: 5-5.5 (Mohs), Color: Deep blue with gold flecks, Luster: Vitreous to greasy, Crystal structure: Cubic (mineral constituents), Specific gravity: 2.7–2.9
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.5 (Mohs), Color: Deep blue with gold flecks, Luster: Vitreous to greasy, Crystal structure: Cubic (mineral constituents), Specific gravity: 2.7–2.9
Formation & geological history
Formed through contact metamorphism of limestone or marble. It is a rock primarily composed of the mineral lazurite, usually with pyrite inclusions and white calcite veining.
Uses & applications
Primary use is in jewelry (beads, cabochons), ornamental carvings, and historically used to create ultramarine pigment for art.
Geological facts
It was highly prized in ancient Egypt and Mesopotamia; the funeral mask of Tutankhamun features lapis lazuli inlays for the eyebrows and eyes.
Field identification & locations
Identify by its characteristic 'Royal Blue' color and the presence of brassy-gold pyrite flecks. High-quality specimens lack visible white calcite.
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