mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue to dark blue with white calcite streaks, Luster: Vitreous to greasy, Crystal Structure: Isometric/Cubic, Cleavage: Poor/Indistinct, Specific Gravity: 2.27-2.33

Hardness: 5

Identified May 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed in sodium-rich igneous rocks (nepheline syenites and phonolites) and associated pegmatites. It crystallizes from silica-undersaturated melts and can also be found in contact metamorphic rocks.

Uses & applications

Primarily used as a decorative stone for ornaments, jewelry (beads, cabochons), carvings, and architectural finishing (countertops and tiles).

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 after large deposits were found in Ontario, Canada. It is often called 'Princess Blue' in honor of Princess Margaret of England. Many specimens are fluorescent under UV light, glowing a bright orange-red.

Field identification & locations

Identify in the field by its distinct blue color and lack of pyrite inclusions (which distinguishes it from Lapis Lazuli). It is commonly found in Brazil, Namibia, Canada (Bancroft), and Russia. Collectors should look for intense blue saturation with interesting white marbling.