Rock Identifier
Small polished blue-gray stone, likely sodalite or dyed gemstone (Probable sodalite (Na₈Al₆Si₆O₂₄Cl₂); identification is uncertain from the distant image) — mineral
mineral

Small polished blue-gray stone, likely sodalite or dyed gemstone

Probable sodalite (Na₈Al₆Si₆O₂₄Cl₂); identification is uncertain from the distant image

AI-generated identification · may be incorrect

Appears as a tiny square-cut, polished blue-gray specimen with pale mottling and a vitreous-to-waxy luster. Sodalite has Mohs hardness 5.5–6, cubic structure, poor cleavage, and specific gravity about 2.2–2.4.

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Physical properties

Appears as a tiny square-cut, polished blue-gray specimen with pale mottling and a vitreous-to-waxy luster. Sodalite has Mohs hardness 5.5–6, cubic structure, poor cleavage, and specific gravity about 2.2–2.4.

Formation & geological history

Sodalite forms in silica-poor, alkaline igneous rocks such as nepheline syenite, generally in Precambrian to younger alkaline complexes. The visible piece may be cut or mounted rather than natural-looking.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and mineral specimen; it has limited industrial use. Similar blue stones may include dyed howlite, lapis lazuli, or blue calcite.

Geological facts

Sodalite commonly shows white veining or patches of calcite and is often confused with lapis lazuli. A definitive identification requires close examination, hardness testing, and ideally microscopy or chemical analysis.

Field identification & locations

Common sources include Canada, Brazil, Namibia, Russia, and Greenland. Check for blue color, white calcite veining, moderate hardness, and a nonmetallic luster; avoid testing if polished or valuable.