sedimentary

Yellow-brown river pebble

Likely iron-stained quartzite or chert; exact identification requires testing

AI-generated identification · may be incorrect

Fine-grained, opaque, yellow-orange surface with dull to subtly waxy luster and rounded water-worn shape; likely hardness 6.5–7 Mohs, with no visible cleavage. The color commonly reflects iron-oxide staining.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably a stream- or beach-rounded fragment derived from weathered siliceous bedrock; its original geological age and formation environment cannot be determined from the image.

Uses & applications

Primarily a common decorative or collecting pebble; if quartzite or chert, similar material is used locally as aggregate, road stone, or historically for tools. It has negligible jewelry value unless unusually patterned or polished.

Geological facts

The smooth, compact appearance is consistent with microcrystalline silica, but some fine-grained volcanic or iron-rich rocks can look similar. A steel file should not scratch quartzite or chert, while vinegar generally produces no reaction.

Field identification & locations

Common in river gravels and glacial deposits worldwide. Check for a glassy fracture, translucent edges, and hardness; a streak test, density measurement, and close inspection of texture would improve identification.