sedimentary

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Hardness: 6-7 (Mohs); Color: Red-brown, tan, earthy; Luster: Dull/Earthy; Texture: Granular, clastic; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Red-brown, tan, earthy
Luster: Dull/Earthy

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Red-brown, tan, earthy; Luster: Dull/Earthy; Texture: Granular, clastic; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. The red hue indicates high iron oxide (hematite/limonite) content, likely formed in an oxidizing terrestrial environment.

Uses & applications

Commonly used as a building material, paving stone, and in glass manufacturing if high in silica. Collectors value specimens with unique weathering or iron banding.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The red color in this specimen is essentially 'rust' within the stone, often indicating formation in arid, desert-like conditions.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It is extremely common worldwide in plateau and canyon regions. Look for bedding planes or layering.