sedimentary

Sandstone

Quartzose Sandstone

Hardness of 6-7 on the Mohs scale, typically tan, brown, or reddish, with a dull to vitreous luster and granular texture.

Identified October 25, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on the Mohs scale, typically tan, brown, or reddish, with a dull to vitreous luster and granular texture.

Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years.

Widely used in construction as a building material, for paving, and in the manufacture of glass.

Sandstone formations often preserve ancient desert environments and riverbeds, making them key for studying geological history.

Easily identified by its gritty, sandpaper-like texture and visible mineral grains, commonly found in desert regions and 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)