mineral

Sodalite (in Matrix)

Sodalite Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0 Mohs; Color: Blue mottled with white (calcite) and grey; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Blue mottled with white (calcite) and grey
Luster: Vitreous to greasy

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Blue mottled with white (calcite) and grey; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33.

Formation & geological history

Forms in sodium-rich igneous rocks such as nepheline syenites and phonolites. It typically occurs in massive form within plutonic environments where silica is scarce.

Uses & applications

Used primarily for ornamental jewelry, decorative carvings, beads, and as a popular specimen for mineral collectors. Occasionally used as a dimension stone for luxury countertops.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks. Large deposits are found in Bancroft, Ontario, leading it to be called 'Princess Blue'.

Field identification & locations

Identify by its characteristic royal blue color marbled with white calcite streaks. It is frequently found in Brazil, Namibia, Canada, and Russia. Collectors value deep blue saturation over white matrix.