sedimentary
River Pebble (Sandstone / Quartzite)
SiO2 (Quartz-rich sedimentary rock)
Hardness: 6-7 on Mohs scale; Color: Brownish-gray with fine grainy texture; Luster: Dull to earthy; Fracture: Conchoidal to uneven; Density: 2.65 g/cm3.
- Hardness
- 6-7 on Mohs scale
- Color
- Brownish-gray with fine grainy texture
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Brownish-gray with fine grainy texture; Luster: Dull to earthy; Fracture: Conchoidal to uneven; Density: 2.65 g/cm3.
Formation & geological history
Formed from the deposition and cementation of sand-sized quartz grains, smoothed and rounded over time by wave action or flowing river water.
Uses & applications
Used in landscaping, decorative stone arrangements, aquariums, massage therapy (hot stones), and aggregate in construction.
Geological facts
The rounded, smooth shape is called an ellipsoidal pebble, formed by saltation where water rolls and bounces stones along riverbeds, wearing away all sharp edges.
Field identification & locations
Commonly found along riverbanks, ocean beaches, and glacial outwash plains. Identified by its smooth, oval contour and fine, sandy surface texture.
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