sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (on Mohs scale); Color: Pinkish-tan/buff; Luster: Dull/earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (on Mohs scale)
Color: Pinkish-tan/buff
Luster: Dull/earthy

Identified March 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale); Color: Pinkish-tan/buff; Luster: Dull/earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. This specific specimen shows signs of water-smoothing (river rock pebbles).

Uses & applications

Used extensively in construction as dimension stone, for road base, as a reservoir for oil/gas, and for aquifer storage.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Its porosity makes it one of the most important rocks for storing groundwater and petroleum.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible grains. Commonly found in deserts, riverbeds, and basin areas. Collectors look for unique banding or fossils within the matrix.