sedimentary

Sandstone

Arenite (SiO2 primarily)

Mohs Hardness: 6-7; Color: Tan, brown, reddish-pink; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7
Color: Tan, brown, reddish-pink
Luster: Dull/Earthy

Identified June 29, 2026More sedimentary →

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Physical properties

Mohs Hardness: 6-7; Color: Tan, brown, reddish-pink; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) at the Earth's surface and within bodies of water over millions of years. This specimen shows distinct bedding planes or laminations.

Uses & applications

Commonly used as a building material, in the manufacturing of glass, for road construction, and as a reservoir rock for oil and gas.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. It is famous for creating the spectacular scenery of the American Southwest, such as the Grand Canyon and Zion National Park.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible layered bedding. It is found globally in deserts, riverbeds, and coastal regions. Collectors look for unique weathering patterns or fossils within the layers.