sedimentary
River Pebble (Sandstone)
Quartz-rich Sandstone Pebble
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
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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.
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