sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-bearing sandstone with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs if quartzite; gray-brown surface, pale cream weathering rind, dull to weakly vitreous luster, and no obvious cleavage. The rounded shape and apparent granular texture suggest abrasion in stream or beach sediment.

Identified August 18, 2026More sedimentary →

Explore Rounded quartz-rich pebble in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Probably a weathered and transported clast derived from quartz-rich sandstone or metamorphosed sandstone; its exact geological age cannot be determined from the image. Rounding formed through prolonged water or sediment transport.

Uses & applications

Primarily a natural- history or lapidary specimen; quartzite can be crushed for aggregate, while attractive pieces may be polished. This ordinary pebble has little commercial value.

Geological facts

The pale patches may be quartz veins, feldspar, or weathered cement rather than a distinct gemstone. A glass-scratch test can help distinguish quartz-rich material from softer rocks.

Field identification & locations

Common in stream gravels, beaches, glacial deposits, and weathered bedrock. Test a fresh edge for quartz hardness, inspect for interlocking grains, and use dilute acid only if carbonate material is suspected.