sedimentary

Sandstone

Clastic Sedimentary Rock

Hardness of 6-7 on Mohs scale, typically brown, tan, or reddish, dull luster, composed mainly of quartz sand grains cemented together.

Identified November 8, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on Mohs scale, typically brown, tan, or reddish, dull luster, composed mainly of quartz sand grains cemented together.

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

Widely used in construction, building facades, paving stones, and historically for whetstones.

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

Identified by its gritty, sandpaper-like texture and visible mineral 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)