sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Brown, red, or tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Brown, red, or tan
Luster: Dull/Earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Brown, red, or tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The brown color indicates the presence of iron oxide (hematite or limonite). Typically found in ancient desert, river, or coastal environments.

Uses & applications

Used primarily in construction as a building stone or road aggregate. In some cases, it is used for grindstones or industrial sand casting.

Geological facts

Sandstone accounts for about 20% of all sedimentary rocks on Earth. Famous formations include the Grand Canyon and the red rocks of Sedona, Arizona.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often shows bedding layers. It is ubiquitous in sedimentary basins and mountain ranges globally.