mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to violet-blue, often with white calcite veining
Luster: Vitreous to greasy

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic environments. Most specimens come from Pre-Cambrian to Mesozoic formations.

Uses & applications

Used primarily as a gemstone, for decorative carvings, lapidary work, beads, and sometimes as architectural stone in countertops or tiles.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada. It is often confused with Lapis Lazuli but lacks the gold pyrite inclusions typical of Lapis.

Field identification & locations

Identify by its deep blue color, white calcite streaks, and lack of pyrite. It is common in Brazil, Canada (Bancroft), Namibia, and Russia. To distinguish from lapis, check for a lower specific gravity and the absence of golden metallic flecks.