mineral

Blue Sodalite (Tumbled)

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, white, and grey; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27 to 2.33.

Hardness: 5
Color: typically royal blue, white, and grey
Luster: Vitreous to greasy

Identified March 27, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, white, and grey; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27 to 2.33.

Formation & geological history

Formed in sodium-rich igneous rocks, particularly nepheline syenites and phonolites. It is also found in metasomatized calcareous rocks. Deposits can range from hundreds of millions to billions of years old.

Uses & applications

Used primarily in jewelry (cabochons and beads), decorative carvings, and as a popular specimen for crystal collectors. It is also used as a gemstone for its aesthetic resemblance to lapis lazuli.

Geological facts

Sodalite was first discovered by Europeans in Greenland in 1811, but it did not become an important ornamental stone until 1891 when vast deposits were found in Ontario, Canada, during a royal visit by Princess Margaret.

Field identification & locations

Identify in the field by its characteristic deep blue color with white calcite veining. It is distinguishably lighter and less dense than lapis lazuli and lacks the gold pyrite inclusions common in lapis. Common locations include Canada, Namibia, Brazil, and Russia.

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