sedimentary
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff color; Luster: Dull to earthy; Crystal structure: Clastic (made of sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, or buff color
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff color; Luster: Dull to earthy; Crystal structure: Clastic (made of sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of mineral particles or rock fragments. This specific specimen has been chemically and physically weathered and rounded by the action of water in a river or stream environment over hundreds to thousands of years.
Uses & applications
Used primarily in landscaping, construction aggregate, and as decorative garden stones. Larger deposits are quarried for building stone.
Geological facts
Riverstones are among the most common geological specimens found globally. They serve as historical records of water flow and erosion, often being transported miles from their original source.
Field identification & locations
Identify by the presence of visible sand grains and its smooth, rounded exterior caused by river transport. Commonly found in riverbeds, deltas, and glacial outwash plains. Look for a gritty texture compared to smoother basalt or limestone.
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