sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed predominantly of sand-sized grains, 0.0625 to 2 mm)
Hardness: 6-7 (based on quartz content); Color: Tan, grey, brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (based on quartz content)
- Color
- Tan, grey, brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (based on quartz content); Color: Tan, grey, brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles (detritus) or rock fragments. Likely deposited in a high-energy environment such as a river bed (fluvial) or shoreline, where smaller particles are washed away.
Uses & applications
Used widely in construction as a building stone (dimension stone), as a source of silica for glass making, and for pavers or landscaping.
Geological facts
Sandstone is often porous enough to act as a reservoir for water (aquifers) or oil and gas. It often preserves sedimentary structures like ripple marks or cross-bedding.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible bedding planes. Found globally in basins and near current or ancient water bodies.
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