sedimentary

Water-worn sandstone pebble

Quartz-rich sandstone (likely arkosic or ferruginous sandstone)

AI-generated identification · may be incorrect

Fine-grained, rounded pebble with tan-brown color, dull to slightly silky luster, and subtle horizontal bedding. Hardness is approximately 6–7 overall because of quartz grains; granular texture and no obvious cleavage, with specific gravity around 2.2–2.7.

Identified August 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand deposited in an ancient river, beach, dune, or shallow-marine environment, then compacted and cemented by silica, iron oxide, or carbonate. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; this small specimen has mainly educational or modest collecting value.

Geological facts

The rounded outline and smoothed surface indicate abrasion during transport, likely in a stream or along a beach. The faint parallel bands may be sedimentary bedding or color variation from iron-rich cement.

Field identification & locations

Identify it by visible grains, layered structure, earthy color, and a generally gritty feel; it should not fizz with dilute acid unless carbonate cement is present. Common worldwide, especially in sandstone and alluvial regions.