![Lapis Lazuli (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2) — metamorphic](https://media.rock.id/d82b9059-8953-412a-a857-8923eb31868b-compressed.jpg)
metamorphic
Lapis Lazuli
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2
Hardness: 5-5.5 on Mohs scale; Color: deep celestial blue with golden pyrite inclusions and white calcite veining; Luster: vitreous to greasy; Crystal Structure: Aggregate/Isometric (lazurite); Specific Gravity: 2.7–2.9.
- Hardness
- 5-5
- Luster
- vitreous to greasy
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Physical properties
Hardness: 5-5.5 on Mohs scale; Color: deep celestial blue with golden pyrite inclusions and white calcite veining; Luster: vitreous to greasy; Crystal Structure: Aggregate/Isometric (lazurite); Specific Gravity: 2.7–2.9.
Formation & geological history
Formed through contact metamorphism of limestone or marble by hydrothermal processes. Major deposits are found in crystalline marble. Most famous deposits in Afghanistan date back over 6,000 years.
Uses & applications
Used primarily in jewelry, ornamental carvings, and pigments. Historically ground into 'ultramarine' pigment for fine arts. Popular as a healing stone in metaphysical communities.
Geological facts
Lapis lazuli was favored by Ancient Egyptian pharaohs; the mask of Tutankhamun features lapis lazuli insets. It is technically a rock composed of multiple minerals, primarily lazurite, calcite, and pyrite.
Field identification & locations
Identify by its rich blue color and the presence of golden pyrite flecks. High quality lapis has uniform deep blue color. Commonly found in Afghanistan, Chile, Russia, and Canada.
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