sedimentary

Rounded river pebble, likely sandstone or quartzite

Unidentified silicate-rich pebble; visual appearance is consistent with sandstone, but quartzite is also possible

AI-generated identification · may be incorrect

Muted tan-gray, fine-grained and rounded, with a dull to slightly granular surface. Hardness and crystal structure cannot be established from the image; sandstone varies, while quartzite is mainly interlocking quartz grains (Mohs 7).

Identified October 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Water-worn during transport in a stream or shoreline setting; its source rock may be much older, but age and exact formation cannot be determined visually.

Uses & applications

Typically collected as a keepsake or used in landscaping and decorative crafts; no notable gemstone or industrial value is apparent.

Geological facts

Repeated abrasion in moving water rounds rock fragments and smooths their surfaces.

Field identification & locations

A small, rounded, uniformly granular pebble suggests prolonged transport, but a fresh break or hardness test is needed to distinguish sandstone from quartzite. Similar pebbles occur in riverbeds and beaches worldwide.