sedimentary
Sandstone pebble
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs); Color: greyish-green with tan bands; Luster: dull to earthy; Texture: fine-grained, gritty feel; Specific gravity: approx. 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- greyish-green with tan bands
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: greyish-green with tan bands; Luster: dull to earthy; Texture: fine-grained, gritty feel; Specific gravity: approx. 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (clasts) over millions of years, often in riverbeds or coastal environments
Uses & applications
Commonly used as decorative landscaping stone, aggregate in construction, and for educational study
Geological facts
This specimen appears to be a water-worn river pebble, showing natural smoothing from abrasion against other rocks and water current
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering or bedding planes. Frequently found in riverbeds, beaches, and glacial till
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