sedimentary
River Pebble
Quartzite / Lithic Sandstone
Hardness: 6-7 on the Mohs scale. Color: Grayish-brown. Luster: Dull to sub-vitreous. Crystal structure: Cryptocrystalline to fine-grained clastic. Cleavage: None. Specific gravity: 2.65-2.75.
- Hardness
- 6-7 on the Mohs scale
- Color
- Grayish-brown
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: Grayish-brown. Luster: Dull to sub-vitreous. Crystal structure: Cryptocrystalline to fine-grained clastic. Cleavage: None. Specific gravity: 2.65-2.75.
Formation & geological history
Formed through the weathering and erosion of parent rocks, transported by water currents in rivers or streams, and smoothed by mechanical abrasion over thousands to millions of years.
Uses & applications
Used in landscaping, decorative garden paths, construction aggregate, and as a natural talisman or skip stone.
Geological facts
Water-worn pebbles like this one are classic examples of hydraulic transport and abrasion, where sharp edges are systematically rounded by colliding with other rocks along riverbeds.
Field identification & locations
Found abundantly in and along riverbeds, glacial outwash plains, and beaches worldwide. Easily identified by its smooth, rounded, oblong shape and fine-grained texture.
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