sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Hardness: 6-7 (Mohs scale), Color: Brownish-red to rusty orange, Luster: Dull or earthy, Texture: Granular/gritty like sandpaper, Clastic structure with visible layering (bedding).

Identified July 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Brownish-red to rusty orange, Luster: Dull or earthy, Texture: Granular/gritty like sandpaper, Clastic structure with visible layering (bedding).

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments. The red color is typically due to the oxidation of iron-bearing minerals (hematite). This specimen appears water-worn, likely from a river or coastal environment.

Uses & applications

Commonly used as a dimension stone for construction, paving, and architectural facades. In natural form, it is used for landscaping and as a teaching specimen for sedimentary processes.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. Red sandstone, specifically the Old Red Sandstone, was used by James Hutton to establish the vastness of geological time.

Field identification & locations

Identifiable by its gritty texture and visible horizontal bedding planes. It feels like sandpaper to the touch. It is found globally in basins where ancient rivers or deserts deposited massive amounts of sand.