sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Hardness: 6-7 Mohs; Color: Tan, yellow, or buff; Luster: Dull/Earthy; Texture: Clastic (sand-sized grains); Structure: Massive or bedded

Hardness: 6-7 Mohs
Color: Tan, yellow, or buff
Luster: Dull/Earthy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, yellow, or buff; Luster: Dull/Earthy; Texture: Clastic (sand-sized grains); Structure: Massive or bedded

Formation & geological history

Formed by the accumulation of sand-sized mineral grains or rock fragments, cemented together by pressure and minerals like silica or calcium carbonate. This specimen likely originates from a terrestrial or shallow marine environment.

Uses & applications

Commonly used as a building material, in the manufacture of glass, and as a natural reservoir for groundwater and petroleum.

Geological facts

Sandstone can vary greatly in color depending on the impurities; for example, iron oxides create red and pink shades. It makes up about 20-25% of all sedimentary rocks on Earth.

Field identification & locations

Identified by a gritty feel similar to sandpaper. It is found globally in deserts, river basins, and coastal areas. Collectors look for unique banding or fossil inclusions.