sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: reddish-brown to terracotta; Luster: dull/earthy; Texture: granular like sandpaper; specific gravity: 2.2-2.8.

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

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown to terracotta; Luster: dull/earthy; Texture: granular like sandpaper; specific gravity: 2.2-2.8.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, primarily quartz and feldspar, often in desert or river environments where iron oxide (hematite) provides the red pigmentation.

Uses & applications

Widely used as a construction material (brownstone), paving, architectural decorative stone, and crushed for gravel. Fine specimens are used for landscaping or carving.

Geological facts

The red color is caused by the oxidation of iron minerals, essentially making the rock 'rusted'. It is a key component of iconic landscapes like the Grand Canyon and Sedona, Arizona.

Field identification & locations

Identify by its gritty texture and characteristic red streak. Commonly found in basinal sedimentary sequences worldwide. Collectors look for unique weathering patterns or fossils within the layers.