sedimentary

Sandstone

Clastic Sedimentary Rock

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

Identified October 29, 2026More sedimentary →

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Physical properties

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

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

Commonly used in construction as a building material, dimension stone, and for paving or landscaping.

Sandstone formations often preserve ancient desert dunes and riverbeds, providing vital clues about prehistoric climates.

Easily identified by its visible sand grains and gritty texture, found globally in arid regions, deserts, and ancient river basins.

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)