sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Goethite coatings
Hardness: 6-7 (on Mohs scale); Color: Greyish-green with yellowish-orange iron staining; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 (on Mohs scale)
- Color
- Greyish-green with yellowish-orange iron staining
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Greyish-green with yellowish-orange iron staining; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed from the lithification of sand-sized mineral particles or rock fragments, typically in river beds, beaches, or shallow seas. This specimen was likely smoothed by water erosion in a fluvial or coastal environment.
Uses & applications
Primarily used as aggregate in construction, landscaping, or as garden decoration due to its rounded, natural shape.
Geological facts
The orange-yellow ring on the surface is likely a 'Liesegang ring' or similar iron oxide staining caused by the weathering of iron-rich minerals during chemical weathering processes.
Field identification & locations
Identify by its grainy texture and the presence of oxidized staining. Commonly found in riverbeds, glacial tills, and shoreline deposits worldwide.
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