sedimentary

Sandstone (with Iron Oxide staining)

Arenite (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Yellowish-tan to rusty brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.

Hardness: 6-7 (Mohs scale)
Color: Yellowish-tan to rusty brown
Luster: Dull/Earthy

Identified March 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Yellowish-tan to rusty brown; 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 silicate grains (mostly quartz) in environments such as rivers, deserts, or marine basins. The yellowish-brown color indicates oxidation of iron minerals during or after deposition.

Uses & applications

Commonly used as a building material, paving stone, and in the manufacturing of glass or grindstones. Highly valued in landscaping for its natural aesthetic and durability.

Geological facts

Sandstone layers can act as massive aquifers or petroleum reservoirs due to their high porosity. Famous formations include the Antelope Canyon in Arizona and the red rocks of Sedona.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible layers (bedding). Rubbing it may cause small grains of sand to dislodge. Found globally in sedimentary basins and outcrops.