Lapis Lazuli
Lapis Lazuli (Rock, predominantly Lazurite with Calcite and Pyrite) · Semi-Precious Gemstone and Decorative Stone
Crystal System
Isometric (Cubic) for Lazurite; typically occurs as massive or compact rocks rather than distinct crystal forms
Mineral Group
Silicates (specifically Feldspathoid group)
Chemical Formula
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Lazurite as the primary constituent)
Formation Process
Metamorphic, specifically contact metamorphism of limestone into skarn deposits
About This Crystal
Tumbled stone featuring a deep, vibrant royal blue color with mottled white calcite patches and subtle metallic pyrite flecks, opaque with a smooth, waxy luster from tumbling
Physical Characteristics
Deep blue body color with white and metallic gold inclusions; white to light blue streak; cleavage is imperfect; fracture is uneven to conchoidal; specific gravity is around 2.5 to 3.0; brittle tenacity
Optical Properties
Isotropic (singly refractive) for lazurite components; refractive index is approximately 1.50; opaque with no notable pleochroism or dispersion
Hardness & Durability
Origin Region
Notable sources include Badakhshan province in Afghanistan, Chile, Russia, and the United States
Hardness & Durability
Mohs hardness of 5 to 5.5; moderate toughness but sensitive to scratching; sensitive to acids, heat, and harsh chemicals due to the presence of calcite and pyrite
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam cleaners, harsh chemicals, and prolonged exposure to direct sunlight or water soaking
Rarity & Value
Common to uncommon depending on grade; high-grade material with deep blue color and minimal white calcite or excessive pyrite is more valuable; treatments may include stabilizing or dyeing lower-grade material
Special Characteristics
Contains characteristic golden-yellow pyrite inclusions resembling starry night skies and white calcite mottling; occasionally exhibits faint orange fluorescence under UV light
Lore & History
Historically used by ancient civilizations in Egypt, Mesopotamia, and antiquity for royal jewelry, amulets, and powdered into ultramarine pigment for master artworks; associated with the third eye chakra, wisdom, truth, and inner power in modern crystal lore