![Lapis Lazuli (Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2) — metamorphic](https://media.rock.id/8a408332-d8f8-4fab-b666-3c1cb5db996d-compressed.jpg)
metamorphic
Lapis Lazuli
Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2
Hardness: 5-5.5 (Mohs scale), Color: Intense royal blue with gold flecks (pyrite) and white streaks (calcite), Luster: Vitreous to greasy, Structure: Isometric (granular aggregate), Specific Gravity: 2.7-2.9
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.5 (Mohs scale), Color: Intense royal blue with gold flecks (pyrite) and white streaks (calcite), Luster: Vitreous to greasy, Structure: Isometric (granular aggregate), Specific Gravity: 2.7-2.9
Formation & geological history
Formed by contact metamorphism of limestone or marble by granitic or alkaline intrusions. Predominantly found in old geological formations like the Hindu Kush in Afghanistan.
Uses & applications
Used extensively in jewelry as cabochons, decorative carvings, or crushed for historical ultramarine pigment. High ornamental and collecting value.
Geological facts
Ancient Egyptians used it for amulets and the mask of Tutankhamun. Until the 19th century, it was the only source for ultramarine pigment used by Renaissance painters.
Field identification & locations
Identified by its rich blue color and presence of brassy pyrite inclusions. Commonly found in Afghanistan, Chile, and Russia. Beware of synthetic sodalite or dyed jasper.
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