mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Typically deep royal blue with white veining or patches, vitreous to greasy luster, and commonly massive rather than visibly crystalline. Mohs hardness is 5.5–6; cleavage is poor to indistinct and specific gravity is about 2.25–2.35.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, alkaline igneous rocks such as nepheline syenite and related pegmatites, crystallizing from sodium-rich magmas. Most specimens are Paleozoic to younger, though deposits span much of geological time.

Uses & applications

Used as an ornamental and carving stone, in beads and cabochons, and occasionally as a blue pigment or decorative aggregate. It is generally inexpensive compared with lapis lazuli.

Geological facts

The blue color comes largely from sulfur-related defects in the crystal structure; white areas are commonly calcite or other feldspathoid minerals. A tumbled surface obscures crystal form and cleavage.

Field identification & locations

Commonly found in Canada, Brazil, Namibia, Russia, and Afghanistan; distinguish it from lapis lazuli by its usually uniform blue color and lack of abundant metallic-gold pyrite. A calcite reaction may occur on white veins, but testing a polished piece is inadvisable.