sedimentary

Red Sandstone

Arenite (with iron oxide cement)

Mohs hardness: 6-7 (depending on quartz content), Color: Red to reddish-brown, Luster: Dull/Earthy, Grain size: Medium (0.06 to 2 mm), Texture: Clastic, Porous

Luster: Dull/Earthy, Grain size: Medium (0

Identified July 17, 2026More sedimentary →

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Physical properties

Mohs hardness: 6-7 (depending on quartz content), Color: Red to reddish-brown, Luster: Dull/Earthy, Grain size: Medium (0.06 to 2 mm), Texture: Clastic, Porous

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in arid environments, riverbeds, or beaches. The red color indicates the presence of hematite or iron oxide.

Uses & applications

Extensively used as a building material, decorative stone in landscaping, and for architectural carvings. Historically used for many world-famous monuments.

Geological facts

The famous 'Red Rocks' of Colorado and the sandstone structures in Petra, Jordan, are iconic examples of this rock type. It is one of the most common sedimentary rocks on Earth.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible layering (bedding). It will not fizz with acid unless it contains calcite cement. Common in 'red bed' formations globally.