mineral
Tumbled brown jasper
Microcrystalline quartz (chalcedony), SiO₂; likely jasper
AI-generated identification · may be incorrectOpaque olive-brown, smoothly polished, with a waxy-to-glassy luster; quartz hardness is about 6.5–7 Mohs, and its crystals are too fine to see. The image alone cannot confirm the exact jasper variety or composition.
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Physical properties
Opaque olive-brown, smoothly polished, with a waxy-to-glassy luster; quartz hardness is about 6.5–7 Mohs, and its crystals are too fine to see. The image alone cannot confirm the exact jasper variety or composition.
Formation & geological history
Jasper forms when silica-rich fluids fill cavities or replace rocks, often incorporating iron oxides that create brown coloration. Its formation age depends on the source deposit and cannot be determined from the image.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; this small tumbled piece is primarily a collector or craft item.
Geological facts
Jasper is an opaque variety of chalcedony; its color and patterns arise from mineral impurities and inclusions.
Field identification & locations
A smooth, opaque pebble with no visible cleavage and a quartz-like hardness is consistent with tumbled jasper. Jasper occurs in many regions worldwide; a scratch test or mineral analysis would help verify identification.
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