sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange due to iron oxides; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porous structure

Hardness: 6-7 (Mohs)
Color: Tan, brown, reddish-orange due to iron oxides
Luster: Dull/Earthy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange due to iron oxides; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porous structure

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in desert, river, or coastal environments. This specimen shows heavy staining from iron-rich groundwater.

Uses & applications

Commonly used as a building material, paving stones, and as a reservoir rock for oil, gas, and groundwater in geological formations.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The red and brown colors are often caused by the presence of Hematite or Goethite coating the sand grains.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in canyon walls, riverbanks, and sedimentary basins.