mineral

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly colored by iron oxides

AI-generated identification · may be incorrect

Small rounded pebble with reddish-brown color, dull to slightly waxy luster, and no visible cleavage; quartz-rich material is typically Mohs hardness 6.5–7 and has a specific gravity around 2.6.

Identified August 23, 2026More mineral →

Explore Likely tumbled jasper or iron-rich chert in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Small rounded pebble with reddish-brown color, dull to slightly waxy luster, and no visible cleavage; quartz-rich material is typically Mohs hardness 6.5–7 and has a specific gravity around 2.6.

Formation & geological history

Formed when silica-rich fluids cemented or replaced sediment, with iron oxides producing the brown-red coloration; its exact geological age and locality cannot be determined from the image.

Uses & applications

Commonly used for polished stones, cabochons, beads, carvings, and lapidary specimens; not generally used as a major construction stone at this size.

Geological facts

Jasper and chert are varieties of opaque, cryptocrystalline quartz and can look nearly identical without a hardness or streak test.

Field identification & locations

Likely a naturally rounded or tumbled specimen; test whether it scratches glass and inspect a fresh edge for a smooth, glassy fracture. Common sources include deserts, river gravels, and volcanic or sedimentary terrains worldwide.