mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Usually deep royal blue with white calcite veining; vitreous to greasy luster and massive, granular structure. Mohs hardness 5.5–6, specific gravity about 2.25–2.35; cleavage is poor to indistinct.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenites and related alkaline complexes. It crystallizes during late-stage magmatic processes, generally in Precambrian to younger alkaline provinces.

Uses & applications

Used as an ornamental and lapidary stone for cabochons, beads, carvings, and tumbled specimens; occasionally used as a blue pigment or architectural stone. It is generally less valuable than lapis lazuli.

Geological facts

Its blue color is commonly associated with sulfur-related defects or minor polysulfide components. White veining is typically calcite, and some specimens fluoresce orange under ultraviolet light.

Field identification & locations

Identify it by its vivid blue color, relatively low hardness, opaque appearance, and commonly white calcite patches; unlike lazurite-rich lapis, it lacks abundant metallic pyrite flecks. Common sources include Canada, Brazil, Namibia, and Russia.