sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, or yellowish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Cleavage: None; Grains often feel like sandpaper to the touch.
- Hardness
- 6-7 (Mohs scale) if quartz-rich
- Color
- Tan, beige, or yellowish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, or yellowish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Cleavage: None; Grains often feel like sandpaper to the touch.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Produced in high-energy environments like deserts, beaches, or river deltas.
Uses & applications
Construction material, road base, architectural stone, and as a reservoir rock for water, oil, and natural gas.
Geological facts
Sandstone accounts for about 10-20% of all sedimentary rocks on Earth. Its porosity makes it a critical primary source for aquifers and petroleum reservoirs.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in continental shelf and desert regions. Collectors look for unique banding or fossil inclusions.
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