sedimentary

Sandstone (Red/Ferruginous)

Arenite (with iron oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal structure: clastic/granular; Cleavage: none; Specific gravity: 2.2-2.8

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

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal structure: clastic/granular; Cleavage: none; Specific gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains, typically in deserts or river beds. The red color suggests iron oxide precipitation during lithification, often from the Paleozoic or Mesozoic eras.

Uses & applications

Used extensively in the construction industry as a building stone, for paving, grindstones, and sometimes as a decorative landscape feature.

Geological facts

Red sandstone is famous for creating the iconic landscapes of the American Southwest and the 'Old Red Sandstone' formations in Great Britain.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible sand grains. Found globally in ancient sedimentary basins. Collectors should look for unique cross-bedding patterns or fossils.