mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

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

Hardness: 5

Identified March 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas. It is frequently found in alkaline-rich samples like nepheline syenites and phonolites. It typically occurs in plutonic environments rather than volcanic ones.

Uses & applications

Used primarily as an ornamental gemstone, for carvings, and as decorative stone in architecture. In industry, it is also highly valued by collectors for its fluorescent properties under UV light.

Geological facts

Sodalite was first discovered by Europeans in Greenland in 1811, but it became popular in 1891 after a large deposit was found in Ontario, Canada, earning it the nickname 'Princess Blue' after Princess Margaret visited the mine.

Field identification & locations

Identify in the field by its distinct royal blue color and the presence of white (not gold) veins. Unlike Lapis Lazuli, it lacks pyrite inclusions and has a lower specific gravity. Notable locations include Bancroft (Ontario), Brazil, and Namibia.