sedimentary
Sandstone
Arenite (SiO2 principal component)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: tan/buff/brown, Luster: dull/earthy, Crystal structure: clastic texture, Grain size: 0.0625 mm to 2 mm, Feels gritty like sandpaper.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/buff/brown, Luster: dull/earthy, Crystal structure: clastic texture, Grain size: 0.0625 mm to 2 mm, Feels gritty like sandpaper.
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically quartz or feldspar, over millions of years in river beds, deserts, or marine environments.
Uses & applications
Widely used for construction, paving materials, as a building stone for facades, and as a reservoir rock in the petroleum industry due to its porosity.
Geological facts
Sandstone can vary greatly in color depending on the impurities; iron oxides can turn it red or pink. It often preserves sedimentary structures like ripple marks or cross-bedding.
Field identification & locations
Identify by its gritty texture and visible sand grains. It is common globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary