sedimentary

Sandstone

Sandstone (Arenite)

Hardness varies (typically 6-7 if quartz-rich), tan to reddish-brown color, dull to earthy luster, composed of sand-sized grains, granular texture.

Identified August 18, 2026More sedimentary →

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Physical properties

Hardness varies (typically 6-7 if quartz-rich), tan to reddish-brown color, dull to earthy luster, composed of sand-sized grains, granular texture.

Formed by the compaction and cementation of sand grains, typically in ancient beaches, deserts, or riverbeds over millions of years.

Commonly used in construction, landscaping, and as a decorative stone. Historically used for tools like grindstones.

Sandstone is one of the most common types of sedimentary rock and often contains fossils. The reddish color is typically due to iron oxide.

Identified by its gritty, sandpaper-like texture and visible sand grains. Found worldwide in 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)