sedimentary
Sandstone
Clastic sedimentary rock (primarily Quartz)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs); Color: Tan, beige, brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and lithification of sand-sized mineral particles or rock fragments, typically in desert, river, or coastal environments over millions of years.
Uses & applications
Extensively used in construction for tiles, paving, and building facades; historically used for grindstones and statues.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient water bodies, acting as a 'tape recorder' for Earth's surface history.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins and canyons.
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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