sedimentary

Rounded river pebble

Probably quartz-rich sandstone or lithic sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Fine-grained, tan-brown, dull to weakly earthy luster, rounded and smoothed by abrasion; likely Mohs hardness 5–7 depending on quartz content. No visible crystals or cleavage; compact, low-to-moderate porosity.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally weathered and transported clast from a stream, beach, or glacial deposit. Its source rock may be sedimentary and could range from relatively young to ancient; age cannot be determined visually.

Uses & applications

Primarily a decorative or landscaping stone, paperweight, or craft specimen; not generally valuable for jewelry or construction as an individual pebble.

Geological facts

The rounded shape records prolonged mechanical abrasion during transport. The rusty coloration commonly reflects iron-oxide staining or weathering of iron-bearing minerals.

Field identification & locations

Look for gritty texture and possible quartz grains; a glass-scratch test, streak, acid test, and examination of a broken surface would distinguish sandstone from quartzite, basalt, or chert. Common worldwide in riverbeds, beaches, and gravel deposits.