mineral

Tumbled brown stone, likely jasper

Likely microcrystalline quartz (SiO₂), possibly iron-stained jasper; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Opaque to slightly translucent brown, smooth rounded surface, with a dull-to-waxy luster. If jasper, hardness is about 6.5–7 Mohs and its crystal structure is microscopic quartz.

Identified October 12, 2026More mineral →

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Physical properties

Opaque to slightly translucent brown, smooth rounded surface, with a dull-to-waxy luster. If jasper, hardness is about 6.5–7 Mohs and its crystal structure is microscopic quartz.

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, with iron oxides producing brown coloration. Such deposits occur in rocks of many geological ages.

Uses & applications

Used for beads, cabochons, decorative objects, and collecting; this small tumbled piece has little industrial or construction use.

Geological facts

Jasper is an opaque variety of chalcedony, a form of microcrystalline quartz; its color and patterns vary with mineral impurities.

Field identification & locations

The rounded shape suggests tumbling, which obscures natural textures. A hardness or streak test and close inspection for banding would help distinguish jasper from other brown stones.