sedimentary
Sandstone (Quartzite Pebble)
Arenite (SiO2)
Hardness: 6-7 Mohs; Color: Brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.3-2.5
- Hardness
- 6-7 Mohs
- Color
- Brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.3-2.5
Formation & geological history
Formed from the accumulation and cementation of mineral particles or rock fragments of sand size, often in riverbeds or marine environments. This specimen shows significant rounding from water erosion.
Uses & applications
Used primarily as a construction material, in glass manufacturing if high purity quartz, and as decorative gardening stones.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. This specific pebble shape indicates a long history of travel through a high-energy water environment like a river or beach.
Field identification & locations
Identify by its gritty, sandpaper-like feel and the presence of visible grains. Common in sedimentary basins and along coastlines globally.
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