sedimentary
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
Hardness: 6-7 on Mohs scale (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale (if quartz-rich)
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed over millions of years through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert, river, or ocean environments.
Uses & applications
Extensively used in construction for paving, building facades, and as a source of high-purity silica for glass manufacturing.
Geological facts
Sandstone can preserve fossilized footprints or ripple marks from ancient riverbeds, providing a 'snapshot' of environmental conditions from millions of years ago.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Commonly found in canyons, riverbeds, and sedimentary basins worldwide. Popular for garden landscaping.
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