sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or yellow-brown; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, beige, or yellow-brown
Luster: Dull or earthy

Identified June 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or yellow-brown; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through lithification. Common in river deltas, beaches, and deserts.

Uses & applications

Used widely in construction and masonry, as a building stone, and as a raw material in glass manufacturing. Some varieties are used for grindstones and artistic sculptures.

Geological facts

Sandstone makes up about 10-25% of the sedimentary rock on Earth. It is porous and often acts as a critical aquifer for groundwater or a reservoir for oil and natural gas.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible bedding planes. Found in sedimentary basins worldwide. Often used by hikers to sharpen tools in emergencies.