mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0 on Mohs scale; Color: Royal blue, grey, white, green; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, grey, white, green
Luster: Vitreous to greasy

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 on Mohs scale; Color: Royal blue, grey, white, green; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Formation & geological history

Forms in sodium-rich igneous rocks (nepheline syenites and phonolites). Often crystallized from late-stage hydrothermal fluids. Significant deposits found in Brazil, Namibia, Canada, and Greenland.

Uses & applications

Primarily used as a gemstone, for decorative carvings, and as architectural stone. Occasionally used in industrial applications as a light-sensitive material in cathode ray tubes (rare).

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the pyrite inclusions typical of Lapis and has a lower price point. It is a major component of a rock called Sodalite Syenite.

Field identification & locations

Identify by its deep royal blue color with white calcite veining. It streaks white (unlike lapis which streaks blue) and is typically less translucent than sapphire. Often found in mass form rather than distinct crystals.