sedimentary

Sandstone

Clastic sedimentary rock

Hardness of 6-7, brown to red color, dull luster, composed primarily of quartz sand grains cemented together.

Identified October 30, 2026More sedimentary →

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Physical properties

Hardness of 6-7, brown to red color, dull luster, composed primarily of quartz sand grains cemented together.

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments in marine, lake, or desert environments.

Widely used in construction, building facades, paving, and as a decorative stone.

Sandstone formations often preserve ancient ripple marks and fossil footprints, providing clues to prehistoric environments.

Identified by its gritty texture resembling sandpaper and visible mineral grains; found worldwide in sedimentary 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)