sedimentary
River Stone (River Pebbles)
Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)
Hardness: 6-7 (Mohs); Color: Tan, brown, grey, and ochre; Luster: Dull to waxy; Texture: Smooth, rounded, water-worn; SG: ~2.65
- Hardness
- 6-7 (Mohs)
- Color
- Tan, brown, grey, and ochre
- Luster
- Dull to waxy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, brown, grey, and ochre; Luster: Dull to waxy; Texture: Smooth, rounded, water-worn; SG: ~2.65
Formation & geological history
Formed through the erosion of larger rock formations, transported by water over long periods where abrasive action smooths the edges. Age ranges from thousands to millions of years depending on the parent material.
Uses & applications
Landscaping, decorative gardening, construction aggregate, drainage systems, and walkway paving.
Geological facts
The smooth, rounded shape is a result of fluvial abrasion, a process where rocks collide and grind against each other in moving water environments. Large deposits are often found in ancient riverbeds.
Field identification & locations
Identify by the distinct rounded edges and variety of colors in a single deposit. Frequently found in stream beds, floodplains, and glacial outwash plains.
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