sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 on Mohs scale (depending on cementation); Color: Tan, yellow, or buff with darker grain clusters; Luster: Dull or earthy; Crystal Structure: Clastic texture with sand-sized grains (0.0625 to 2 mm); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale (depending on cementation)
Color: Tan, yellow, or buff with darker grain clusters
Luster: Dull or earthy

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or coastal environments. This specimen appears to be weathered silicate sandstone.

Uses & applications

Used widely in construction for building stone, paving, and decorative garden features. Also used as a reservoir rock for oil and gas.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and Zion National Park are composed largely of various layers of sandstone.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible grains. Often shows bedding layers. Commonly found in fluvial (river) or marine sedimentary basins.