sedimentary
Sandstone
Clastic Sedimentary Rock
AI-generated identification · may be incorrectMohs hardness 6 to 7, reddish-brown to tan color, dull or earthy luster, composed primarily of quartz sand grains cemented by silica or calcite.
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Physical properties
Mohs hardness 6 to 7, reddish-brown to tan color, dull or earthy luster, composed primarily of quartz sand grains cemented by silica or calcite.
Formation & geological history
Formed through the accumulation, compaction, and lithification of mineral particles or rock fragments, typically in desert, river, or beach environments.
Uses & applications
Widely used as a construction and building material, dimension stone, and in glass manufacturing.
Geological facts
Sandstone formations often preserve ancient ripple marks and fossil tracks, providing clues to prehistoric environments.
Field identification & locations
Easily identified by its gritty, sandpaper-like texture and visible mineral grains, found globally in sedimentary basins.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Shale
Fissile Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Shale
Clastic sedimentary rock
sedimentary