Lapis Lazuli
Lazurite aggregate (Rock composed mainly of Lazurite, Calcite, and Pyrite) · Decorative Stone and Semi-Precious Gemstone
Crystal System
Cubic (Isometric) for individual mineral components; massive or tumbled habit for this specimen
Mineral Group
Silicate, specifically Tectosilicate (Feldspathoid group)
Chemical Formula
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Lazurite component)
Formation Process
Metamorphic formation resulting from contact metamorphism of limestone into skarn
About This Crystal
A polished, tumbled stone displaying a deep royal blue color with distinct white patches of calcite and metallic brass-yellow flecks of pyrite inclusions
Physical Characteristics
Rich royal blue body color with white and golden patches; light blue streak; cleavage is poor; fracture is uneven to conchoidal; specific gravity is around 2.7 to 2.9; opaque with a vitreous to greasy luster
Optical Properties
Isotropic (singly refractive) lazurite, though as an aggregate it shows complex optical properties; refractive index is approximately 1.50 to 1.67
Hardness & Durability
Origin Region
Badakhshan province in Afghanistan, with other sources in Chile, Russia, and the USA
Hardness & Durability
Mohs hardness of 5 to 5.5; fair to moderate durability; sensitive to scratching, acids, and thermal shock; care is required in jewelry
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight or extreme heat
Rarity & Value
Common to Uncommon depending on grade; high-grade Persian quality is rare and valuable; enhanced sometimes through dyeing or waxing
Special Characteristics
Distinctive brassy pyrite flecks and white calcite mottling creating a starry night appearance
Lore & History
Used extensively by ancient civilizations including the Egyptians, Mesopotamians, and Greeks for amulets, royal jewelry, and powdered as ultramarine pigment for paintings; traditionally associated with the third eye and throat chakras, representing truth and wisdom