sedimentary

Hematitic Sandstone

Sandstone with Hematite inclusions (SiO2 + Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Grey with distinct reddish-purple hematite bands; Luster: Dull, earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None

Hardness: 6-7 (Mohs)
Color: Grey with distinct reddish-purple hematite bands
Luster: Dull, earthy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Grey with distinct reddish-purple hematite bands; Luster: Dull, earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains, with iron oxide (hematite) leaching into the layers during lithification in oxygen-rich environments.

Uses & applications

Used primarily as construction aggregate, building stone, and occasionally as a low-grade iron ore source or decorative garden stone.

Geological facts

The red color in this specimen is caused by the oxidation of iron, literally the same process that causes rust. Sandstone makes up about 20% of all sedimentary rocks on Earth.

Field identification & locations

Identify by the gritty sand-paper texture and the characteristic reddish staining that does not rub off. Common in sedimentary basins and canyon walls.