sedimentary

Sandstone

Sedimentary rock composed mainly of quartz and feldspar

Hardness of 6-7 on the Mohs scale, varies in color from tan and brown to red and yellow, dull to earthy luster, clastic texture.

Identified November 2, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on the Mohs scale, varies in color from tan and brown to red and yellow, dull to earthy luster, clastic texture.

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

Widely used in construction as a building material, for paving, and in landscaping.

Sandstone formations often preserve ancient environments and fossil footprints due to rapid sediment accumulation.

Identified by its gritty texture and visible sand grains; commonly found worldwide in sedimentary basins and escarpments.

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)