sedimentary

Sandstone

Clastic Sedimentary Rock

Hardness varies from 6 to 7 on the Mohs scale depending on cementation, typically brown, tan, or reddish with a dull luster and clastic texture.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness varies from 6 to 7 on the Mohs scale depending on cementation, typically brown, tan, or reddish with a dull luster and clastic texture.

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

Widely used in construction, dimension stone, paving, and as a reservoir rock for groundwater and petroleum.

Sandstone formations often preserve ancient desert environments and riverbeds, containing important fossil records.

Identified by its visible sand grains and gritty texture; commonly found in deserts, river basins, and canyon walls worldwide.

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)