sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or brownish-grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (breaks across grains); Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, or brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or brownish-grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (breaks across grains); Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments. This specimen appears to be lithified sand grains deposited in a terrestrial or near-shore environment during various geologic periods.
Uses & applications
Commonly used as a construction material (dimension stone), in glass manufacturing (if high purity silica), and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. It is porous and often acts as a natural aquifer for groundwater.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. Found globally in deserts, riverbeds, and ocean basins. It often displays bedding planes or cross-stratification in larger outcrops.
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