sedimentary
Sandstone (with differential weathering)
Arenite / Quartz Sandstone (SiO2)
Hardness: 6-7 Mohs; Color: Light grey to beige; Luster: Dull/Earthy; Structure: Clastic with concentric erosion patterns; Cleavage: None
- Hardness
- 6-7 Mohs
- Color
- Light grey to beige
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Light grey to beige; Luster: Dull/Earthy; Structure: Clastic with concentric erosion patterns; Cleavage: None
Formation & geological history
Formed from the accumulation and cementation of mineral particles (lithification) in high-energy aquatic environments. The concentric rings are caused by differential weathering of harder and softer layers, or potentially Liesegang rings (chemical precipitation).
Uses & applications
Common industrial sand source, construction filler, decorative garden stone, and educational geological specimen.
Geological facts
Sandstone makes up about 10-20% of all sedimentary rocks on Earth. The concentric pattern on this specific river-worn pebble showcases 'onion-skin' or spheroidal weathering, where layers peel away like an onion.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible bedding planes. Commonly found in riverbeds, beaches, and canyons.
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