sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs); Color: Tan, cream, and brown with distinct banding; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Gritty texture like sandpaper.

Hardness: 6-7 (Mohs)
Color: Tan, cream, and brown with distinct banding
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, cream, and brown with distinct banding; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Gritty texture like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen shows distinct bedding planes (stripes) likely formed in a river or desert environment.

Uses & applications

Commonly used as a building material, for paving, in the manufacture of glass, and as a reservoir rock in the petroleum industry.

Geological facts

Sandstone can be found in almost every color, but the most common are tan, brown, yellow, and red. It accounts for about 20-25% of all sedimentary rocks on Earth.

Field identification & locations

Identify in the field by its sandy, gritty feel when rubbed. It often features visible layers or cross-bedding. Common in canyons, desert bluffs, and riverbeds.