metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock; (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
Hardness: 5-5.5 (Mohs), Color: Deep celestial blue with golden pyrite inclusions and white calcite streaks, Luster: Dull to vitreous, Crystal Structure: Isometric (for constituent lazurite), Specific Gravity: 2.7-2.9
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.5 (Mohs), Color: Deep celestial blue with golden pyrite inclusions and white calcite streaks, Luster: Dull to vitreous, Crystal Structure: Isometric (for constituent lazurite), Specific Gravity: 2.7-2.9
Formation & geological history
Formed through the contact metamorphism of limestone or marble, typically in crystalline marble host rocks containing iron and sulfur.
Uses & applications
Used primarily in jewelry, ornamental carvings, pigments (historical ultramarine paint), and metaphysical objects like dowsing pendulums.
Geological facts
Lapis lazuli was highly prized in ancient Egypt for amulets and death masks, notably Tutankhamun's. It was the source of the most expensive blue pigment in the Renaissance.
Field identification & locations
Identify by its characteristic intense blue color and the presence of golden pyrite specks. Unlike plastic imitations, it remains cold and does not melt; unlike sodalite, it usually contains pyrite and is more opaque.
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