sedimentary

Sandstone

Arenite

Hardness: 6-7 (Mohs); Color: Tan, beige, or light grey; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, beige, or light grey
Luster: Dull/Earthy

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, beige, or light grey; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) of sand size. Primarily composed of quartz and/or feldspar. High-energy environments like beaches, deserts, and riverbeds.

Uses & applications

Widely used in construction for building stone, flagstone, and as a raw material for making glass. Also used for decorative carving and decorative landscape rocks.

Geological facts

Sandstone makes up about 10-25% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum because of its porosity.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. Often found in layered outcrops or as river bed stones. Use a magnifying glass to see the individual cemented sand grains.