sedimentary
Sandstone
Arenite (SiO2 principal component)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: tan, reddish-brown, yellow, Luster: dull to earthy, Crystal Structure: Clastic texture with sand-sized grains, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, reddish-brown, yellow, Luster: dull to earthy, Crystal Structure: Clastic texture with sand-sized grains, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments. It typically forms in desert, river, or coastal environments over millions of years through lithification.
Uses & applications
Used extensively in construction as a building material, for paving stones, grindstones, and sometimes as a source of silica for glass making.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient environments. It is a major reservoir rock for groundwater and petroleum.
Field identification & locations
Identified by its gritty, sandpaper-like feel. Commonly found in canyon walls, river beds, and coastal outcrops. Collectors look for unique banding or fossil inclusions.
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Fossiliferous Sedimentary Rock
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Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
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Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary