Lapis Lazuli
Lapis Lazuli (Rock, not a single mineral; primary component Lazurite with Calcite and Pyrite) · Semi-Precious Gemstone and Decorative Stone
Crystal System
Cubic (for lazurite component, though lapis lazuli as a rock is massive to granular)
Mineral Group
Silicate (specifically tectosilicate for the feldspathoid group)
Chemical Formula
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Lazurite formula)
Formation Process
Metamorphic formation, typically through contact metamorphism of limestone into skarn
About This Crystal
A polished spherical specimen displaying a rich, deep royal blue background color, mottled with distinctive white veins and patches of calcite, and metallic golden flecks of pyrite scattered across the surface.
Physical Characteristics
Deep royal blue body color with white and golden inclusions; light blue streak; cleavage is poor to none; fracture is uneven to conchoidal; specific gravity is around 2.7-2.9; opaque with a vitreous to greasy luster when polished.
Optical Properties
Isotropic (singly refractive) due to the isometric nature of its primary mineral components, with a refractive index around 1.50.
Hardness & Durability
Origin Region
Badakhshan province in Afghanistan, Baikal region in Russia, and Ovalle in Chile
Hardness & Durability
Mohs hardness of 5 to 5.5; moderate toughness but sensitive to harsh chemicals, acids, and excessive heat due to the presence of calcite and pyrite.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam, and harsh chemical cleaners or acids; store away from harder stones to prevent scratching.
Rarity & Value
Uncommon to moderately rare; value is determined by the saturation of deep blue color, minimal white calcite, and evenly distributed golden pyrite without excessive dark matrix.
Special Characteristics
Notable for its striking natural mosaic appearance created by the contrast of deep blue lazurite, white calcite veins, and metallic golden pyrite flecks.
Lore & History
Historically used by ancient civilizations including the Egyptians, Mesopotamians, and Greeks for amulets, seals, and powdered into ultramarine pigment for master paintings; traditionally associated with wisdom, truth, and the third-eye chakra in crystal lore.