mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly sodalite-rich rock
AI-generated identification · may be incorrectTypically deep royal-blue with white veining, translucent to opaque, vitreous to greasy luster, Mohs hardness 5.5–6, cubic crystal system, and poor cleavage. The rounded shape indicates tumbling and polishing; the gray-green surface may reflect matrix or alteration.
Identified More mineral →
Explore Tumbled sodalite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically deep royal-blue with white veining, translucent to opaque, vitreous to greasy luster, Mohs hardness 5.5–6, cubic crystal system, and poor cleavage. The rounded shape indicates tumbling and polishing; the gray-green surface may reflect matrix or alteration.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite and related alkaline complexes, commonly during late-stage crystallization. Most specimens formed in Precambrian to younger alkaline intrusions.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and decorative objects; prized for its blue color but generally less valuable than lapis lazuli or high-grade sapphire.
Geological facts
Sodalite is a feldspathoid mineral and may fluoresce orange under long-wave ultraviolet light. It is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite grains.
Field identification & locations
Identify by its rich blue color, relatively low hardness, and white calcite-like veining; it is commonly found in Canada, Brazil, Namibia, and Russia. A streak, hardness, or UV test can confirm it, though testing may damage a polished specimen.
