mineral

Polished blue sodalite cabochons

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

AI-generated identification · may be incorrect

Typically deep royal blue with white calcite veining, vitreous to greasy luster, massive structure, and no prominent cleavage; Mohs hardness 5.5–6, specific gravity about 2.27–2.33. The beads are polished and likely drilled, explaining their rounded form and strong surface shine.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Sodalite forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenites, through late-stage magmatic crystallization; most gem material is Precambrian to younger. Major sources include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used for beads, cabochons, carvings, ornamental stone, and minor architectural tile; it is a popular affordable gemstone and lapidary material.

Geological facts

Its intense blue color comes from sulfur-related defects in the crystal structure; white areas are commonly calcite. It can resemble lapis lazuli, but lapis usually contains visible metallic-gold pyrite flecks.

Field identification & locations

Identify it by its saturated blue color, relatively soft surface, and white calcite patches; a streak test is usually white, while acid may weakly react with exposed calcite. These appear to be jewelry-grade drilled beads rather than natural crystal faces.