sedimentary
Sandstone (Quartzose Pebble)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale); Color: Light grey to tan; Luster: Dull/Earthy; Crystal Structure: Clastic grainy texture; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Light grey to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Light grey to tan; Luster: Dull/Earthy; Crystal Structure: Clastic grainy texture; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in marine, river, or desert environments. This specimen exhibits water-worn rounding from fluvial or coastal transport.
Uses & applications
Common varieties are used in construction, glass manufacturing (if high silica), and as decorative landscaping stones.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. This specific pebble has been naturally polished into a 'worry stone' shape by the action of water and abrasive sand.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible grains. Commonly found on beaches, riverbeds, and in desert outcrops worldwide.
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