Lapis Lazuli
Lapis Lazuli (Rock aggregate containing Lazurite, Pyrite, and Calcite) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Cubic (for lazurite, though lapis lazuli is a rock and typically found in massive, compact, or granular habits)
Mineral Group
Silicates (specifically Feldspathoid group for lazurite)
Chemical Formula
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Lazurite primary component) with FeS2 (Pyrite) and CaCO3 (Calcite)
Formation Process
Metamorphic process, typically formed through contact metamorphism of limestone into skarn, alongside high-temperature hydrothermal interactions
About This Crystal
A small, tumbled, heart-shaped or irregularly rounded pocket stone. It exhibits a deep, rich royal blue body color with characteristic golden brassy flecks of pyrite and occasional faint white calcite streaks and mottling. The polish is smooth and glossy with a vitreous to greasy luster, showing opaque to sub-translucent transparency.
Physical Characteristics
Color is deep azure-blue to royal blue, with a light blue streak. It has poor to indistinct cleavage and an uneven to conchoidal fracture. Specific gravity ranges from 2.7 to 2.9. It is brittle in tenacity and generally non-fluorescent, though some calcite components may show a weak orange-pink fluorescence under UV light.
Optical Properties
Isotropic (lazurite is cubic and singly refractive), though aggregate nature can cause complex light scattering. Refractive index is approximately 1.50 to 1.67 depending on the exact mineral constituents. Pleochroism is generally absent or weak due to the aggregate structure.
Hardness & Durability
Origin Region
Badakhshan province in Afghanistan, with secondary deposits in Russia, Chile, the United States, Canada, and Myanmar
Hardness & Durability
Mohs hardness is 5 to 5.5, making it relatively soft and easily scratched by quartz, steel, and harder minerals. It has low toughness due to its porous nature and multi-mineral composition, requiring careful wear to avoid scratching and impact damage.
Care & Maintenance
Clean with a soft, damp cloth and warm soapy water. Never use harsh chemical cleaners, salt solutions, ultrasonic cleaners, or steam, as the porous stone and pyrite inclusions can easily absorb liquids, tarnish, or suffer structural damage. Store separately in a soft pouch away from harder gemstones.
Rarity & Value
Common to Uncommon depending on grade. High-grade material with deep uniform blue and minimal white calcite, featuring well-distributed golden pyrite, commands higher value. Typical tumbled stones are inexpensive and widely accessible. Treatments may include dyeing or wax/resin stabilization to improve color and luster.
Special Characteristics
Distinctive golden flecks and veins of pyrite throughout the deep blue matrix, which helps verify authenticity and distinguishes natural lapis lazuli from synthetic substitutes or dyed imitations.
Lore & History
Historically revered by ancient civilizations including the Mesopotamians, Egyptians, and Greeks, who used it extensively for amulets, royal jewelry, and powdered ultramarine pigment in renaissance paintings. In modern crystal healing, it is traditionally associated with the third eye and throat chakras, symbolizing truth, wisdom, inner vision, and spiritual enlightenment.