sedimentary
Sandstone
Arenite (SiO2 based typically)
Hardness: 6-7 Mohs; Color: Tan, brown, or earthy yellow (often weathered with green lichen/moss); Luster: Dull or earthy; Crystal structure: Clastic/granular texture with visible sand grains; Cleavage: None.
- Hardness
- 6-7 Mohs
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or earthy yellow (often weathered with green lichen/moss); Luster: Dull or earthy; Crystal structure: Clastic/granular texture with visible sand grains; Cleavage: None.
Formation & geological history
Formed via the accumulation and lithification of sand-sized mineral particles or rock fragments, typically in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Extensively used in construction for paving, building facades, and foundations; also used as a reservoir rock in the petroleum industry and for landscaping.
Geological facts
Sandstone is highly porous, making it an excellent aquifer for groundwater or a reservoir for oil and natural gas. It often contains fossils of prehistoric marine or terrestrial life.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layers or bedding. Commonly found in canyons, beaches, and sedimentary basins worldwide.
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