metamorphic
Lapis Lazuli
Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite
Hardness: 5-5.5 (Mohs scale); Color: Deep celestial blue; Luster: Vitreous to greasy; Crystal Structure: Isometric (Lazurite component); Cleavage: Imperfect; Specific Gravity: 2.7 to 2.9
- Hardness
- 5-5
- Color
- Deep celestial blue
- Luster
- Vitreous to greasy
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5-5.5 (Mohs scale); Color: Deep celestial blue; Luster: Vitreous to greasy; Crystal Structure: Isometric (Lazurite component); Cleavage: Imperfect; Specific Gravity: 2.7 to 2.9
Formation & geological history
Formed through contact metamorphism where limestone or dolomite is altered by hydrothermal activity. Major deposits date back over 6,000 years, primarily found in marble host rocks.
Uses & applications
Used extensively in jewelry (cabochons, beads), decorative carvings, and historically as the pigment 'ultramarine'. Also a popular collector's mineral.
Geological facts
Lapis lazuli was used in the funeral mask of Tutankhamun and was favored by Renaissance artists like Vermeer for high-end paint pigment. It is one of the oldest traded gemstones in human history.
Field identification & locations
Identify by its intense blue color often speckled with golden pyrite 'flecking' and white calcite veins. Commonly found in Afghanistan (Sar-i Sang), Chile, and Russia. Collectors look for deep blue saturation with minimal calcite.
More like this
