mineral
Tumbled jasper (likely)
Microcrystalline quartz, SiO₂; likely jasper, a variety of chalcedony
AI-generated identification · may be incorrectOpaque, mottled cream, brown, and reddish tones with a smooth tumbled surface; quartz hardness 6.5–7, vitreous to waxy luster, no visible crystal faces or cleavage. Exact identification is uncertain from the image alone.
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Physical properties
Opaque, mottled cream, brown, and reddish tones with a smooth tumbled surface; quartz hardness 6.5–7, vitreous to waxy luster, no visible crystal faces or cleavage. Exact identification is uncertain from the image alone.
Formation & geological history
Jasper forms when silica-rich fluids fill cavities or replace material in rocks, with iron and other impurities producing its colors. Deposits occur in many geological ages and settings.
Uses & applications
Commonly cut and polished for beads, cabochons, ornaments, and small collectibles; not typically used as an industrial or building stone.
Geological facts
Jasper is an opaque form of chalcedony; its patterns and colors vary widely with mineral impurities.
Field identification & locations
Look for opaque, fine-grained material, distinctive mottling, and a smooth conchoidal fracture on an unpolished edge. The photographed piece is rounded and polished, so field identification is limited.
