sedimentary
Sandstone Pebble (Ventifact)
Arenite (mostly SiO2)
Hardness: 6-7 (Mohs); Color: Tan/Beige; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded with a distinct wind-etched depression.
- Hardness
- 6-7 (Mohs)
- Color
- Tan/Beige
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan/Beige; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded with a distinct wind-etched depression.
Formation & geological history
Formed from compressed sand grains over millions of years (sedimentary). This specific shape is likely a ventifact, created by aeolian (wind) abrasion or mechanical water erosion in a riverbed or coastal environment.
Uses & applications
Used as construction aggregate, decorative garden stones, and for geological study of erosion patterns.
Geological facts
The unique indentation suggests it may be a 'ventifact', a rock that has been pitted or faceted by the abrasive action of wind-blown sand in arid environments.
Field identification & locations
Commonly found in riverbeds, deserts, or glacial outwash plains. Identified by its gritty texture and smooth, wind or water-worn facets.
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