sedimentary

Sandstone

Arenite

Hardness: 6-7 Mohs; Color: Light grey to beige; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Light grey to beige
Luster: Dull/Earthy

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Light grey to beige; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments, typically through pressure and mineral cementation (silica or calcium carbonate) over millions of years in river, ocean, or desert environments.

Uses & applications

Commonly used as a building material, in decorative masonry, as a source of silica for glass making, and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone can be composed of almost any mineral, but most commonly consists of quartz and feldspar because these are the most resistant to weathering at the Earth's surface.

Field identification & locations

Identified by its gritty 'sandpaper' feel and visible granular texture. Can be found in many diverse geological settings globally. For collectors, it is often collected for its layering or when it contains fossils.