sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand grains

Hardness of 6-7 on Mohs scale. Colors range from tan, brown, yellow, red, to grey. Vitreous to dull luster.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on Mohs scale. Colors range from tan, brown, yellow, red, to grey. Vitreous to dull luster.

Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, typically in desert, river, or marine environments.

Widely used in construction as building stone, paving material, and in the manufacturing of glass.

Sandstone formations can be millions of years old and often preserve ancient ripple marks and fossilized tracks.

Easily identified by its gritty texture and visible sand grains; commonly found in sedimentary basins 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)