sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Tan, brown, and reddish-orange due to iron oxides; Luster: Dull/Earthy; Texture: Granular/Sand-like; Structure: Bedded or massive.

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

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, and reddish-orange due to iron oxides; Luster: Dull/Earthy; Texture: Granular/Sand-like; Structure: Bedded or massive.

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral particles or rock fragments, typically in river beds, deserts, or coastal environments. This specimen shows water-worn smoothing, likely from a river environment.

Uses & applications

Used widely in construction as a building stone, in road base, and as a raw material for glass manufacturing. Smaller river-worn pieces are used in landscaping or as decorative garden stones.

Geological facts

Sandstone stores much of the world's groundwater and oil reserves due to its high porosity and permeability. The reddish bands often indicate fluctuating water tables where iron was oxidized.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and riverbeds. Common and easy for beginners to find.