sedimentary
Sandstone Pebble
Sandstone (Quartz-rich Arenite)
Hardness: 6-7 on Mohs scale. Color: grayish-buff to dull tan. Luster: dull to earthy. Grain size: fine to medium sand grains. Cleavage: none. Specific gravity: approx. 2.2-2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- grayish-buff to dull tan
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale. Color: grayish-buff to dull tan. Luster: dull to earthy. Grain size: fine to medium sand grains. Cleavage: none. Specific gravity: approx. 2.2-2.8.
Formation & geological history
Formed by the compaction and cementation of sand-sized mineral grains or rock fragments, typically in river beds, beaches, or desert environments. This specimen has been rounded by fluvial or coastal water action.
Uses & applications
Commonly used in construction, landscaping, road base, and aggregate. Smooth beach or river pebbles are often collected for decorative rock gardens or crafts.
Geological facts
River and beach abrasion naturally shapes rough angular stones into smooth, rounded pebbles over thousands to millions of years.
Field identification & locations
Identified by its gritty texture (feels like sandpaper when rubbed) and rounded, water-worn shape. Commonly found along riverbanks, lake shores, beaches, and glacial till deposits.
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