sedimentary

Sandstone

Clastic Sedimentary Rock

Hardness of 6 to 7 on the Mohs scale, typically brown, tan, or reddish in color with a dull to earthy luster and a granular crystal structure.

Identified October 23, 2026More sedimentary →

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Physical properties

Hardness of 6 to 7 on the Mohs scale, typically brown, tan, or reddish in color with a dull to earthy luster and a granular crystal structure.

Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years.

Widely used in construction as a building material, for paving, and in the manufacturing of glass and abrasives.

Sandstone formations can store vast quantities of groundwater and petroleum, making them crucial reservoir rocks for energy resources.

Identified easily by its visible sand-sized grains and gritty texture; commonly found in deserts, riverbeds, and ancient marine environments.

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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)