sedimentary

Sandstone (with Iron Oxide)

Arenite / Quartzose Sandstone

Mohs hardness 6-7, dull to earthy luster, rough gritty texture, tan to yellowish-brown with dark iron-rich spotting.

Identified October 25, 2026More sedimentary →

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Physical properties

Mohs hardness 6-7, dull to earthy luster, rough gritty texture, tan to yellowish-brown with dark iron-rich spotting.

Formed through the deposition, compaction, and cementation of mineral particles and quartz sand grains over millions of years.

Commonly used as building stone, flagstone, paving material, and in landscaping or crushed aggregate.

Iron oxides such as hematite and limonite are common natural cementing agents that give sandstone its warm yellow, red, and brown hues.

Easily identified by its sandpaper-like feel and visible quartz grains; widespread in sedimentary basins, riverbeds, and cliffs 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)