mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: vitreous to greasy; Crystal Structure: cubic; Cleavage: poor/indistinct; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: typically royal blue, gray, or white
Luster: vitreous to greasy

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: vitreous to greasy; Crystal Structure: cubic; Cleavage: poor/indistinct; Specific Gravity: 2.27-2.33.

Formation & geological history

Forms primarily in alkali-rich igneous rocks like nepheline syenites and phonolites. It can also form in metasomatized calcareous rocks.

Uses & applications

Used primarily for ornamental purposes, such as jewelry (cabochons and beads), carvings, figurines, and architectural inlay/tiling.

Geological facts

Sodalite is often confused with Lapis Lazuli; however, Sodalite lacks the golden pyrite inclusions common in Lapis. It is also well-known for being a component of fluorescent rocks like 'Yooperlites' found in the Great Lakes region.

Field identification & locations

Identify by its deep blue color often streaked with white calcite. Unlike Lapis, it has a lower specific gravity and rarely contains pyrite. Commonly found in Bancroft (Ontario), Brazil, and Greenland.