![Lapis Lazuli (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2) — metamorphic](https://media.rockidentification.com/b9f2228a-b154-4068-b74d-c6b13a2abc7a-compressed.jpg)
metamorphic
Lapis Lazuli
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2
Hardness: 5-5.5 (Mohs scale); Color: Deep blue with gold-flecked pyrite inclusions; Luster: Vitreous to greasy; Crystal structure: Isometric (dodecahedral crystals are rare); Cleavage: Imperfect; Specific Gravity: 2.7 to 2.9
- Hardness
- 5-5
- Color
- Deep blue with gold-flecked pyrite inclusions
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5-5.5 (Mohs scale); Color: Deep blue with gold-flecked pyrite inclusions; Luster: Vitreous to greasy; Crystal structure: Isometric (dodecahedral crystals are rare); Cleavage: Imperfect; Specific Gravity: 2.7 to 2.9
Formation & geological history
Formed by contact metamorphism of limestone or marble into which magma has intruded. It is mainly composed of lazurite, calcite, and pyrite.
Uses & applications
Used primarily in jewelry, ornamental carvings, and historically as a source for the pigment ultramarine.
Geological facts
Lapis lazuli was used in the burial mask of Tutankhamun. It has been mined in the Badakhshan province of Afghanistan for over 6,000 years, making it one of the longest-used gemstones in human history.
Field identification & locations
Identify by its intense 'royal blue' color and the presence of golden pyrite flecks. High-quality specimens have minimal white calcite veining. Found mostly in Afghanistan, Russia, Chile, and Myanmar.
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