sedimentary
Sandstone
Arenite (SiO2 primarily)
AI-generated identification · may be incorrectMohs hardness: 6-7, color: tan/brown/yellow, luster: dull/earthy, texture: clastic (gritty), structure: massive or layered.
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Physical properties
Mohs hardness: 6-7, color: tan/brown/yellow, luster: dull/earthy, texture: clastic (gritty), structure: massive or layered.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in deserts, riverbeds, or ocean basins.
Uses & applications
Widely used for construction, decorative stone, pavement, and as an aquifer for groundwater and petroleum reservoirs.
Geological facts
Sandstone is highly porous and permeable, making it the most common rock type to harbor natural gas and oil. Some sandstones contain fossils of ancient life.
Field identification & locations
Identified by its gritty feel (like sandpaper). Common in arid regions and canyon landscapes. Collectors look for unique banding patterns like 'picture sandstone'.
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Other sedimentary specimens
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