sedimentary
Sandstone
Arenite (SiO2 primarily)
AI-generated identification · may be incorrectMohs Hardness: 6.0-7.0 (depending on cementing material); Color: Tan, beige, or gray with visible grains; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None/Grainy fracture; Specific Gravity: 2.2-2.8
- Hardness
- 6
- Color
- Tan, beige, or gray with visible grains
- Luster
- Dull/Earthy
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Physical properties
Mohs Hardness: 6.0-7.0 (depending on cementing material); Color: Tan, beige, or gray with visible grains; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None/Grainy fracture; Specific Gravity: 2.2-2.8
Formation & geological history
Formed via the accumulation and lithification of sand-sized mineral particles or rock fragments, typically in river beds, beaches, or deserts over millions of years. This specimen appears weathered and water-worn.
Uses & applications
Commonly used in construction as a building material and decorative stone, for grinding and sharpening tools, and as a reservoir rock for petroleum and groundwater.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The Great Sphinx of Giza was carved directly from a natural formation of sandstone and limestone.
Field identification & locations
Identified by its gritty 'sandpaper' feel. Commonly found in coastal areas, riverbanks, and desert basins. If it scratches glass, it likely has high quartz content.
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Sedimentary Sandstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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