mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white or grey; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, mottled with white or grey
Luster: Vitreous to greasy

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white or grey; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich, silica-undersaturated magmas, such as nepheline syenites and phonolites. It can also form through contact metamorphism of calcareous rocks.

Uses & applications

Predominantly used as a gemstone for jewelry (beads, cabochons), ornamental carvings, and decorative architectural slabs. Historically used as a blue pigment in some cultures.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions. It is a major component of a rock known as 'Hackmanite', which shows a color-changing property called tenebrescence.

Field identification & locations

Identify by its deep blue color and white streaks/veins of calcite. It is commonly found in the Bancroft area of Ontario (Canada), Brazil, Namibia, and Russia. It lacks the 'sparkle' of pyrite which helps distinguish it from more expensive Lapis.