sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 Mohs; Color: Tan, beige, grey, or brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Feel: Gritty like sandpaper.
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, grey, or brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, grey, or brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Feel: Gritty like sandpaper.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in desert, river, or coastal environments.
Uses & applications
Extensively used in construction for building blocks, flooring, and decorative paving. Also used as a primary source for glass manufacturing (silica sand).
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient water bodies, providing a snapshot of environmental history from millions of years ago.
Field identification & locations
Identify by its gritty texture and visible sand grains. It is often found in canyon walls or near ancient riverbeds. Test by rubbing a finger across it to feel for loose grains.
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Brown Sandstone (River Rock)
Arenite
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Mudstone
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Cone-in-cone structure (Limestone)
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