sedimentary
Sandstone
Arenite
Mohs hardness: 6-7, Color: tan, brown, or grayish. Luster: dull/earthy. Crystal structure: clastic (visible sand grains). Cleavage: none. Specific gravity: 2.2-2.8.
- Hardness
- 6-7, Color: tan, brown, or grayish
- Color
- tan, brown, or grayish
- Luster
- dull/earthy
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Physical properties
Mohs hardness: 6-7, Color: tan, brown, or grayish. Luster: dull/earthy. Crystal structure: clastic (visible sand grains). Cleavage: none. Specific gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in desert, river, or coastal environments. This specimen appears water-worn or weathered into a cobble shape.
Uses & applications
Used extensively in construction for paving, building stone, and as a source of silica for glass manufacturing. Some varieties are used for artistic carvings.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient environments. It is a major reservoir rock for oil, natural gas, and groundwater.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds, canyons, and coastal bluffs.
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