![Lapis Lazuli (Raw Ore) (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)) — metamorphic](https://media.rockidentification.com/3f5f8a89-56ad-417f-8b9d-d5129c7d1b82-compressed.jpg)
metamorphic
Lapis Lazuli (Raw Ore)
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)
Hardness: 5 to 5.5 on Mohs scale. Color: Deep blue mottled with golden pyrite and white calcite/grey host rock. Luster: Dull to greasy (raw), vitreous (polished). Crystal structure: Isometric (dodecahedral). Cleavage: Indistinct.
- Hardness
- 5 to 5
- Luster
- Dull to greasy (raw), vitreous (polished)
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Physical properties
Hardness: 5 to 5.5 on Mohs scale. Color: Deep blue mottled with golden pyrite and white calcite/grey host rock. Luster: Dull to greasy (raw), vitreous (polished). Crystal structure: Isometric (dodecahedral). Cleavage: Indistinct.
Formation & geological history
Formed through contact metamorphism of limestone or marble by granitic or alkaline intrusions. Often found in deposits dating back thousands of years; the primary source in Sar-e-Sang, Afghanistan, has been mined for over 6,000 years.
Uses & applications
Primarily used as a gemstone for jewelry and ornamental carvings. Historically ground into 'ultramarine' pigment for fine art. Also valued in holistic and spiritual practices.
Geological facts
Lapis lazuli is actually a rock, not a single mineral. It is a combination of lazurite (the blue), pyrite (the gold flecks), and calcite (the white streaks). It was used in the funeral mask of Tutankhamun.
Field identification & locations
Identify by its distinct 'royal blue' hue and the presence of golden pyrite inclusions. Common locations include Afghanistan (best quality), Chile, Russia, and the USA (California and Colorado). In its raw form, it looks like a dull grey-brown stone with blue patches.
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