![Lapis Lazuli (Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)) — metamorphic](https://media.rock.id/c6292b92-1642-402f-a015-1538ae9bc979-compressed.jpg)
metamorphic
Lapis Lazuli
Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)
Hardness: 5-5.5 (Mohs scale); Color: Deep blue with gold flecks (pyrite) and white patches (calcite); Luster: Vitreous to greasy; Crystal structure: Cubic (Lazurite component); Specific gravity: 2.7-2.9.
- Hardness
- 5-5
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5-5.5 (Mohs scale); Color: Deep blue with gold flecks (pyrite) and white patches (calcite); Luster: Vitreous to greasy; Crystal structure: Cubic (Lazurite component); Specific gravity: 2.7-2.9.
Formation & geological history
Formed through contact metamorphism where limestone or dolomite is altered by igneous intrusions. Typically found in marble deposits. Famous deposits date back thousands of years.
Uses & applications
Used in jewelry (cabochons, beads), decorative carvings, and historically as the pigment ultramarine for fine art.
Geological facts
Lapis Lazuli was highly prized by Ancient Egyptians for amulets and ornaments. It is not a single mineral but a rock composed primarily of lazurite, calcite, and pyrite.
Field identification & locations
Identify by the distinctive 'royal blue' color and the presence of glittering brass-yellow pyrite inclusions. Common locations include Afghanistan (Badakhshan), Chile, and Russia.
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