mineral
Tumbled brown-blue stone, possibly sodalite-bearing jasper
Likely quartz-rich jasper with blue sodalite or dumortierite; identification is uncertain from the image
AI-generated identification · may be incorrectOpaque, rounded and polished, with brown-red and blue-gray areas and a dull-to-waxy luster; likely hardness about 6–7 Mohs, with no visible cleavage. Specific gravity is probably about 2.6–2.8.
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Physical properties
Opaque, rounded and polished, with brown-red and blue-gray areas and a dull-to-waxy luster; likely hardness about 6–7 Mohs, with no visible cleavage. Specific gravity is probably about 2.6–2.8.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic and sedimentary material; blue sodalite or dumortierite may crystallize during alteration. Such material commonly formed in Precambrian to younger volcanic terrains.
Uses & applications
Used as a decorative tumbled stone, cabochon, bead, or small carving; usually collected for color and pattern rather than rarity.
Geological facts
The visible blue coloration could also indicate dumortierite quartz, blue quartz, or dyed material; a photo alone cannot distinguish these reliably.
Field identification & locations
Common possibilities occur in Brazil, India, Madagascar, Russia, and the United States. Check for dye concentration in cracks, test streak on unglazed ceramic, and avoid destructive hardness testing on polished pieces.
