mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs); Color: Royal blue to gray-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

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

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to gray-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Forms in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites and similar rocks). It is a member of the sodalite mineral group and often associated with fluorite and zircon.

Uses & applications

Used primarily as an ornamental gemstone, in carvings, jewelry (cabochons and beads), and occasionally as dimension stone for architectural accents.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Lapis is a rock containing many minerals while Sodalite is a single mineral species. Sodalite rarely contains the golden pyrite flecks common in Lapis. Hackmanite is a variety of sodalite that exhibits tenebrescence (color change when exposed to sunlight).

Field identification & locations

Identify in the field by its rich blue color and association with white veins. It can be distinguished from Azurite by being significantly harder. Commonly found in Bancroft (Ontario), Brazil, Namibia, and Greenland.