sedimentary

Sandstone

Clastic sedimentary rock composed mainly of quartz sand

Hardness 6-7 on Mohs scale, colors range from tan and brown to red and grey, dull luster, granular texture, specific gravity around 2.2-2.8.

Identified October 31, 2026More sedimentary →

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Physical properties

Hardness 6-7 on Mohs scale, colors range from tan and brown to red and grey, dull luster, granular texture, specific gravity around 2.2-2.8.

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

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

Sandstone often preserves ripple marks and fossilized tracks, providing clues about ancient environments and weather patterns.

Easily identified by its gritty, sandpaper-like texture and visible sand grains; commonly found in layered rock formations 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)