sedimentary

Sandstone

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (depending on cementation); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic texture with visible sand grains; Cleavage: None (fractures across grains); Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale (depending on cementation)
Color: Tan, beige, or light brown
Luster: Dull/Earthy

Identified March 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. This specimen appears to be water-worn or wind-abraded, likely originating from an ancient desert dune or riverbed environment. Ages range from Precambrian to Holocene.

Uses & applications

Widely used as a building material, paving stone, and in the manufacturing of glass. In small tumbled forms, it is used for decorative landscaping or as a tactile 'worry stone' for collectors.

Geological facts

Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. Due to its porosity, it serves as a major reservoir for groundwater and petroleum. Some sandstones, like 'Picture Sandstone,' create natural patterns that look like landscapes.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible layers (bedding). When scratched with a steel blade, it should release individual sand grains. Commonly found in canyons, coastal cliffs, and desert outcrops like those in the Southwest USA.