sedimentary
River Pebble
Siliceous rock fragment
Hardness: 6-7 on the Mohs scale; Color: brownish-green to earthy tones; Luster: dull to sub-vitreous; Structure: smooth, rounded, compact grain; Specific gravity: approx. 2.6-2.7
- Hardness
- 6-7 on the Mohs scale
- Color
- brownish-green to earthy tones
- Luster
- dull to sub-vitreous
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: brownish-green to earthy tones; Luster: dull to sub-vitreous; Structure: smooth, rounded, compact grain; Specific gravity: approx. 2.6-2.7
Formation & geological history
Formed through mechanical weathering, erosion, and long-term water transport in rivers and streams, where jagged fragments are rounded over thousands to millions of years.
Uses & applications
Used in landscaping, decorative ground cover, garden pathways, and raw material for aggregate in construction.
Geological facts
The smooth, rounded shape is a direct result of abrasion as the rock travels along riverbeds, colliding with other stones and sediment in fast-moving water.
Field identification & locations
Commonly found in riverbeds, lake shores, and glacial till deposits worldwide; identified by its smooth, water-worn texture and rounded morphology.
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