sedimentary

River Pebble (Sandstone)

Quartz-rich Sandstone Pebble

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Greyish-brown with fine grainy texture; Luster: Earthy to dull; Crystal Structure: Granular/clastic; Cleavage: None; Specific Gravity: approx. 2.65

Hardness: 6-7 on Mohs scale
Color: Greyish-brown with fine grainy texture
Luster: Earthy to dull

Identified July 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Greyish-brown with fine grainy texture; Luster: Earthy to dull; Crystal Structure: Granular/clastic; Cleavage: None; Specific Gravity: approx. 2.65

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains, primarily quartz. Over time, physical erosion and water action rounded the rock into a smooth river pebble.

Uses & applications

Commonly used in landscaping, river rock decor, construction aggregate, and as a pocket stone.

Geological facts

Water-worn pebbles like this acquire their smooth, rounded shape through abrasion during transport in rivers, streams, or along ocean shores over thousands of years.

Field identification & locations

Identify by its rounded, smooth profile and fine, rough sand-like texture under close inspection. Widely found in riverbeds, glacial deposits, and coastal beaches globally.