sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, brown, or buff with visible bedding planes; Luster: Dull/Earthy; Structure: Clastic, fine to medium-grained; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, brown, or buff with visible bedding planes
Luster: Dull/Earthy

Identified June 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, or buff with visible bedding planes; Luster: Dull/Earthy; Structure: Clastic, fine to medium-grained; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through wind or water transport in desert or marine environments. This specimen appears water-worn.

Uses & applications

Used extensively in construction as building stone, as a source for glass manufacturing (silica sand), and for decorative landscaping and masonry.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. The bedding stripes seen here represent different layers of sediment deposited at different times.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering or laminar bedding. Commonly found in riverbeds, coastal cliffs, and arid canyons.