sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
Hardness: 6-7 Mohs; Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Texture: Gritty like sandpaper; Cleavage: None
- Hardness
- 6-7 Mohs
- Color
- Brownish-red to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Texture: Gritty like sandpaper; Cleavage: None
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically deposited in river beds, deserts, or beaches over millions of years.
Uses & applications
Commonly used as a building material, pavers, decorative stones, and as a reservoir rock for oil and natural gas in the energy industry.
Geological facts
This specimen is a water-worn river cobble. Because it is porous, sandstone can hold significant amounts of water or oil in the gaps between its grains.
Field identification & locations
Identified by its gritty feel and visible sand grains. It is very common in sedimentary basins worldwide. In the field, look for layering (bedding) and test the grit with your fingernail.
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