sedimentary
Sandstone River Pebble
Arenite (SiO2 based)
Hardness: 6-7 Mohs; Color: Tan to grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan to grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral grains, primarily quartz. This specific rounded shape indicates long-term erosion in a high-energy water environment like a river or beach.
Uses & applications
Commonly used as decorative garden stones, in landscaping, as aquarium substrate, or as a pocket stone for tactile relief.
Geological facts
Sandstone records the history of Earth’s surface environments; the roundness of this pebble suggests it has traveled many miles from its original source rock.
Field identification & locations
Identify by its gritty texture (like sandpaper) and visible sand grains. Found globally in riverbeds, glacial deposits, and coastal areas.
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