Sodalite
Sodalite · Semi-Precious Gemstone and Decorative Stone
Crystal System
Cubic (Isometric), typically found in massive, granular, or nodular habits rather than well-formed crystals
Mineral Group
Silicates, specifically the feldspathoid group and tectosilicates
Chemical Formula
Na8Al6Si6O24Cl2
Formation Process
Igneous formation from sodium-rich magmas that are deficient in silica, crystallizing in plutonic environments or pegmatites
About This Crystal
Tumbled, smooth specimen displaying a mottled, mosaic-like pattern of deep royal blue and contrasting opaque white veins and patches, characteristic of sodalite mixed with calcite
Physical Characteristics
Color is royal blue with white calcite inclusions, streak is white, cleavage is poor on {110}, fracture is uneven to conchoidal, specific gravity is approximately 2.15 to 2.35, tenacity is brittle, often exhibits orange-pink fluorescence under longwave UV light
Optical Properties
Isotropic, refractive index ranges from 1.483 to 1.487, vitreous to greasy luster, translucent to opaque
Hardness & Durability
Origin Region
Found in Canada, Greenland, India, Namibia, Russia, and the United States, typically in silica-deficient igneous rocks like nepheline syenites
Hardness & Durability
Mohs hardness of 5.5 to 6, moderate durability, sensitive to strong acids and thermal shock, requires moderate care when worn in jewelry
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemical cleaners, prolonged direct sunlight exposure, and ultrasonic or steam cleaners
Rarity & Value
Common mineral, highly affordable and widely accessible, value is determined by color saturation and the pleasing contrast of white calcite webbing
Special Characteristics
Often exhibits striking white patches or veins of calcite and can display a bright orange-pink fluorescence under ultraviolet light
Lore & History
Discovered in 1811 in Greenland, sodalite gained popularity as an ornamental stone and is traditionally associated in crystal healing with mental clarity, logic, intuition, and balancing the throat chakra