sedimentary
Sandstone
Arenite (SiO2 principal)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs); Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); 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; Crystal structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments, typically sand-sized grains of quartz or feldspar. This specimen appears to be a water-worn river cobble.
Uses & applications
Used widely as a construction material, in road base, for making glass, and as a reservoir rock in the petroleum industry.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is found in sedimentary basins worldwide. It often preserves fossils and ripple marks from ancient environments.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found in deserts, riverbeds, and beach deposits.
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Sandstone or Siltstone
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Septarian Concretion containing Brachiopods/Crinoids
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Quartz pebble
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Generic Pebble / Rock Fragment
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Banded Siltstone / Mudstone Pebble
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