sedimentary

Red Sandstone

Arenite (with Iron Oxide)

Hardness: 6-7 Mohs; Color: Brick red to reddish-brown; Luster: Dull/Earthy; Texture: Granular/Sand-like; Crystal Structure: Clastic

Hardness: 6-7 Mohs
Color: Brick red to reddish-brown
Luster: Dull/Earthy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brick red to reddish-brown; Luster: Dull/Earthy; Texture: Granular/Sand-like; Crystal Structure: Clastic

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains, typically quartz and feldspar. The red color indicates the presence of iron oxide (hematite) during the lithification process, often in arid or fluviatile environments. Age varies by location, often dating from the Paleozoic or Mesozoic eras.

Uses & applications

Commonly used as a building material, in landscaping for decorative gravel or flagstones, and historically in the construction of temples and monuments.

Geological facts

Red sandstone is responsible for some of the world's most spectacular landscapes, such as the Grand Canyon and the Red Rocks of Sedona. It is a porous rock that often serves as an important aquifer for groundwater.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and distinct red rubbing off onto hands when weathered. Found globally in deserts and ancient riverbeds. In the field, look for visible layering or bedding planes.