sedimentary

Sandstone

Clastic Sedimentary Rock

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

Identified November 2, 2026More sedimentary →

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Physical properties

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

Formed through 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.

Sandstone formations often preserve ancient desert environments and riverbeds, containing vital clues about Earth's geological history.

Identified by its gritty texture and visible sand grains; commonly found in deserts, river valleys, and mountainous sedimentary regions.

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)