sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Greyish-tan to light brown; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Greyish-tan to light brown
Luster: Dull/Earthy

Identified June 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Greyish-tan to light brown; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or coastal environments. This specific specimen appears to be water-worn, likely from a fluvial or beach environment.

Uses & applications

Used in construction for masonry, paving, and decorative garden stones. High-purity silica sandstone is used in glass making. Often collected as basic geological specimens.

Geological facts

Sandstone can preserve fossilized footprints or ripple marks from ancient environments. It is a major reservoir rock for groundwater and petroleum because of its porosity.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often found in riverbeds or near coastal cliffs. Check for layering if larger outcrops are present.