sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 (Mohs); Color: Tan, brown, pink, and buff; Luster: Dull/Earthy; Structure: Clastic, fine-to-medium grained; Cleavage: None (conchoidal fracture when silicified); SG: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, brown, pink, and buff
Luster: Dull/Earthy

Identified June 3, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, pink, and buff; Luster: Dull/Earthy; Structure: Clastic, fine-to-medium grained; Cleavage: None (conchoidal fracture when silicified); SG: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or coastal environments. This specimen appears water-worn.

Uses & applications

Used widely in construction for building stone/paving, as a reservoir for oil and water, and in glass manufacturing if high purity quartz is present.

Geological facts

Sandstone often preserves ancient cross-bedding and ripple marks that reveal the direction of water or wind currents from millions of years ago.

Field identification & locations

Identify by its gritty, sandpaper-like feel and the presence of visible sand grains. Commonly found in canyons, riverbeds, and sedimentary basins worldwide.