mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodalite)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to purple-blue with common white streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to purple-blue with common white streaks
Luster: Vitreous to greasy

Identified March 27, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to purple-blue with common white streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Forms in silica-poor igneous rocks (nepheline syenites and phonolites) through late-stage hydrothermal processes. It can also occur in contact metamorphic rocks such as marbles. Deposits found throughout geological eras where alkaline magmatism has occurred.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons and beads), ornamental carvings, and architectural accents. Due to its color, it is also a popular specimen for mineral collectors and is sometimes used as a pigment.

Geological facts

Sodalite is a member of the feldspathoid group. It is sometimes confused with Lapis Lazuli, but Sodalite lacking the gold-colored pyrite inclusions common in Lapis. It frequently exhibits fluorescence under UV light, glowing a bright orange-red.

Field identification & locations

Identify in the field by its characteristic rich blue color, white calcite veins/streaks, and relatively low hardness (can be scratched by quartz). Primarily sourced from Canada (Ontario/Princess Sodalite Mine), Brazil, Namibia, and Russia.