sedimentary

Sandstone

Arenite

Hardness 6-7, tan to light brown, dull luster, clastic texture, gritty feel

Identified September 2, 2026More sedimentary →

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Physical properties

Hardness 6-7, tan to light brown, dull luster, clastic texture, gritty feel

Formed by the consolidation and compaction of sand, held together by a natural cement, such as silica. Found in sedimentary basins.

Used in construction, paving, and sometimes as a whetstone.

Sandstone is one of the most common types of sedimentary rock and is found in sedimentary basins throughout the world.

Identified by its sandy texture and visible grains. Often found near ancient coastlines or riverbeds.

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)

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Quartz pebble

Silicon dioxide (SiO2)