sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown, tan, reddish-orange
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, deserts, or coastal environments. This specimen shows iron-oxide staining (ferruginous), suggesting formation in an oxygen-rich environment.

Uses & applications

Used primarily in construction as a building material, paving, and occasionally for primitive tool sharpening or artistic carvings.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are composed of thick layers of ferruginous sandstone.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible grains. It is extremely common worldwide in sedimentary basins and along historical river paths.