mineral
Polished blue banded stone, likely sodalite or blue apatite
Probable sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue apatite, Ca₅(PO₄)₃(F,Cl,OH)
AI-generated identification · may be incorrectDark blue, glossy polished surface with lighter blue banding; likely Mohs 5.5–6 (sodalite) or 5 (apatite), with vitreous luster and massive/granular structure. No visible cleavage can be assessed from the image.
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Physical properties
Dark blue, glossy polished surface with lighter blue banding; likely Mohs 5.5–6 (sodalite) or 5 (apatite), with vitreous luster and massive/granular structure. No visible cleavage can be assessed from the image.
Formation & geological history
Sodalite forms in silica-poor alkaline igneous rocks, while blue apatite occurs in igneous and metamorphic environments; ages vary widely from Precambrian to recent geological settings.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and ornamental objects; generally decorative rather than industrial.
Geological facts
The strong blue color and banding are consistent with sodalite-group material, though polished lapidary pieces can be difficult to identify visually without tests.
Field identification & locations
Common sodalite sources include Brazil, Canada, Namibia, and Russia. Check streak, hardness, specific gravity, and fluorescence; avoid scratching the polished surface unless testing is acceptable.
