sedimentary

Sandstone (with weathered rind / conglomerate grain)

Arenite

Hardness: 6-7 on Mohs scale (quartz grains); Color: dark brown to grey-tan; Luster: dull, earthy; Texture: coarse-grained to gritty.

Identified November 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale (quartz grains); Color: dark brown to grey-tan; Luster: dull, earthy; Texture: coarse-grained to gritty.

Formed by the compaction and cementation of mineral particles or rock fragments, typically in riverbeds, beaches, or desert environments.

Commonly used in building construction, paving stones, aggregate, and glass manufacture.

Sandstone makes up about 20-25% of all sedimentary rocks and serves as one of the most important reservoir rocks for groundwater and petroleum.

Identified by its rough, sandpaper-like feel and visible granular clasts; widely found across global 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)