mineral
Brown tumbled stone, likely jasper or iron-rich chert
Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert
AI-generated identification · may be incorrectOpaque 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 More mineral →
Explore Brown tumbled stone, likely jasper or iron-rich chert in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
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.
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.
