sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe-oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: tan, grey, and reddish-brown; Luster: dull, earthy; Structure: clastic texture with visible sand-sized grains; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: tan, grey, and reddish-brown
Luster: dull, earthy

Identified July 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: tan, grey, and reddish-brown; Luster: dull, earthy; Structure: clastic texture with visible sand-sized grains; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. This specimen shows iron staining, suggesting deposition in an oxygen-rich environment such as a riverbed or desert.

Uses & applications

Commonly used as a building material, decorative stone in landscaping, or as an abrasive. In the oil and gas industry, it acts as a primary reservoir rock for hydrocarbons.

Geological facts

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. Some of the most iconic landscapes in the world, like the Grand Canyon and Petra, are composed largely of various sandstones.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grainy texture. It may crumble slightly under pressure if the cement is weak. Found globally in basins, coastal areas, and deserts.