Sodalite
Sodalite · Decorative Stone and Semi-Precious Gemstone
Crystal System
Cubic (Isometric), typically found in massive, granular, or nodular habits rather than distinct crystals
Mineral Group
Silicates, specifically Tectosilicates belonging to the feldspathoid group
Chemical Formula
Na8Al6Si6O24Cl2
Formation Process
Igneous, typically forming in silica-poor rocks such as nepheline syenites and associated pegmatites through magmatic crystallization
About This Crystal
The carved figurine displayed shows a mottled deep royal blue coloration intermixed with distinct white calcite veins and patches, exhibiting an opaque to translucent appearance with a vitreous to greasy luster characteristic of polished sodalite
Physical Characteristics
Deep royal blue to violet body color with white or grayish streaks of calcite, poor cleavage on six directions, uneven to conchoidal fracture, specific gravity around 2.27 to 2.33, brittle tenacity, and often exhibits a bright orange-pink fluorescence under longwave UV light
Optical Properties
Singly refractive (isotropic) with a refractive index of approximately 1.483 to 1.487, lacking birefringence and pleochroism due to its isometric crystal system
Hardness & Durability
Origin Region
Notable sources include Brazil, Canada (Ontario), India, Namibia, and the USA (Bancroft area in Ontario is famous for rich blue material)
Hardness & Durability
Mohs hardness of 5.5 to 6, making it moderately hard but somewhat brittle with poor cleavage, suitable for pendants, earrings, and carved decorative items rather than high-impact rings
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoiding harsh chemicals, ultrasonic cleaners, and steam cleaners; store separately from harder gems to prevent scratching and protect from prolonged direct sunlight
Rarity & Value
Common mineral, though high-grade uniform blue material without excessive white veining is more prized; carved items and tumbled stones are generally very affordable and widely accessible
Special Characteristics
Often features distinct white mottling or veining from calcite inclusions, and some varieties (known as hackmanite) exhibit tenebrescence (color change when exposed to sunlight)
Lore & History
Discovered in 1806 in Greenland and introduced more widely after large deposits were found in Canada in 1891, where it was favored by royalty such as Princess Margaret; in modern metaphysical practices, it is associated with the throat chakra, logic, truth, and emotional balance, though these remain traditional beliefs