sedimentary
Coarse Sandstone
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, or grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of mineral particles (lithification) in high-energy environments like riverbeds or coastal dunes over millions of years.
Uses & applications
Extensively used in construction as an aggregate, road base, or building stone; also used in glass manufacturing if silica content is high.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. Iconic landmarks like the Grand Canyon are primarily composed of various sandstone layers.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible grains. Found globally in basins and sedimentary outcroppings. Collectors look for unique banding or fossil inclusions.
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