mineral

Brown tumbled stone, likely jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert

AI-generated identification · may be incorrect

Opaque brown to reddish-brown with darker patches and a subtle waxy luster; likely hardness 6.5–7, no visible cleavage, and conchoidal fracture hidden by polishing. Exact identification is uncertain from the image alone.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Jasper and chert form when silica-rich fluids replace or cement sediment, with iron oxides producing the brown coloration; formation ages range from Precambrian to relatively recent. The rounded shape indicates human tumbling or natural abrasion.

Uses & applications

Used as a decorative stone, tumbled specimen, cabochon, bead, and minor lapidary material; generally not used structurally.

Geological facts

A steel file should not easily scratch it, while quartz can scratch it. A streak test on unglazed porcelain may reveal little to no streak, helping distinguish it from softer iron minerals.

Field identification & locations

Common in silica-rich gravels and volcanic or sedimentary terrains worldwide, including the western United States, Australia, Brazil, and India. Confirm with hardness, specific gravity, and a close examination of texture; it may also be brown agate.