mineral
Blue sodalite specimens
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, commonly with white calcite veining
AI-generated identification · may be incorrectUsually deep royal to gray-blue with white veining or patches; vitreous to greasy luster and massive or granular structure. Mohs hardness 5.5–6, poor cleavage, white streak, and specific gravity about 2.2–2.4.
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Physical properties
Usually deep royal to gray-blue with white veining or patches; vitreous to greasy luster and massive or granular structure. Mohs hardness 5.5–6, poor cleavage, white streak, and specific gravity about 2.2–2.4.
Formation & geological history
Forms in silica-poor, sodium-rich alkaline igneous rocks such as nepheline syenites and associated pegmatites. Most specimens formed in Precambrian to younger alkaline complexes; exact age depends on locality.
Uses & applications
Used as an ornamental and lapidary stone for carvings, cabochons, beads, and tumbled stones; attractive cabinet specimens are collected. It has limited industrial use.
Geological facts
The image appears to show several pieces of blue sodalite, including polished and rough material; white areas are likely calcite or feldspar. Sodalite is commonly confused with lapis lazuli, but typically lacks abundant metallic pyrite flecks.
Field identification & locations
Identify by its intense blue color, white veining, moderate hardness, and absence of pyrite; localities include Canada, Brazil, Russia, Namibia, and Afghanistan. A streak, hardness, and acid test on calcite veining can help confirm it.
