sedimentary

Sandstone

Clastic Sedimentary Rock

Mohs hardness 6 to 7 depending on cement, colors range from tan and brown to red and grey, dull luster, composed primarily of quartz grains.

Identified November 12, 2026More sedimentary →

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Physical properties

Mohs hardness 6 to 7 depending on cement, colors range from tan and brown to red and grey, dull luster, composed primarily of quartz grains.

Formed by 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, paving stone, and in manufacturing glass.

Sandstone often preserves ancient environments through ripple marks and fossilized tracks left on prehistoric beaches or deserts.

Identified by its visible sand-sized grains and gritty texture; commonly found in desert regions, riverbeds, and cliff formations 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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)