mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectTypically deep royal blue to blue-gray with white veining, vitreous to greasy luster, and massive rather than visibly crystalline texture. Mohs hardness 5.5–6; poor cleavage, specific gravity about 2.25–2.35.
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Physical properties
Typically deep royal blue to blue-gray with white veining, vitreous to greasy luster, and massive rather than visibly crystalline texture. Mohs hardness 5.5–6; poor cleavage, specific gravity about 2.25–2.35.
Formation & geological history
Forms in silica-po deficient, sodium-rich igneous rocks, especially nepheline syenites and related alkaline environments. Most specimens are Precambrian to younger, with major deposits in Canada, Brazil, and Namibia.
Uses & applications
Used as an ornamental stone, carving and cabochon material, bead material, and inexpensive polished collector specimens; rarely used as a gemstone because it is relatively soft.
Geological facts
Its intense blue color can resemble lapis lazuli, but sodalite commonly has less metallic pyrite and a more uniform blue-gray appearance. Tumbled surfaces may obscure cleavage and crystal form.
Field identification & locations
Identify by blue color, white calcite-like veining, moderate softness, and lack of obvious pyrite; a streak, hardness, or UV test can help distinguish it from lapis lazuli and dyed stones. Common localities include Ontario, Quebec, Brazil, and Namibia.
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