sedimentary

Red Sandstone

Arenite (SiO2 based with Fe2O3)

Hardness: 6-7 Mohs; Color: reddish-brown to pink; Luster: dull/earthy; Grain size: 0.1mm to 2mm; Texture: gritty like sandpaper.

Hardness: 6-7 Mohs
Color: reddish-brown to pink
Luster: dull/earthy

Identified July 11, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown to pink; Luster: dull/earthy; Grain size: 0.1mm to 2mm; Texture: gritty like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river environments. The red color is due to iron oxide (hematite) staining of the quartz grains.

Uses & applications

Used extensively in construction as building stone, pavers, and crushed stone for roads. Popular in landscaping and architectural veneers.

Geological facts

Red sandstone formations like the Old Red Sandstone in Europe or the Navajo Sandstone in the US reveal crucial info about ancient paleoclimates. Many famous canyons are carved from this material.

Field identification & locations

Identify by its sandpaper-like feel and the fact that it won't fizz with vinegar (distinguishing it from limestone). Commonly found in sedimentary basins and as common gravel.