sedimentary

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale for grains); Color: Yellowish-brown to tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Feel: Gritty like sandpaper.

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

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale for grains); Color: Yellowish-brown to tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Feel: Gritty like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The yellowish color indicates the presence of iron oxide minerals like limonite, typically formed in oxygen-rich terrestrial or shallow marine environments.

Uses & applications

Used primarily in construction as a building material, for paving, and as an abrasive. In smaller specimens, it is used for educational purposes and geological study.

Geological facts

Sandstone contains a record of the earth's history, often preserving ripple marks, cross-bedding, and occasionally fossils that indicate the direction of ancient water currents.

Field identification & locations

Identify in the field by its distinctive 'sandpaper' texture when rubbed. It is found globally in sedimentary basins, desert dunes, and ancient riverbeds.