sedimentary

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: tan, buff, or light grey; Luster: dull/earthy; Crystal structure: granular/clastic; Cleavage: none; Specific gravity: approx. 2.2-2.8. Feels gritty like sandpaper.

Hardness: 6-7 (Mohs scale)
Color: tan, buff, or light grey
Luster: dull/earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: tan, buff, or light grey; Luster: dull/earthy; Crystal structure: granular/clastic; Cleavage: none; Specific gravity: approx. 2.2-2.8. Feels gritty like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specific specimen appears water-worn, suggesting it was shaped in a riverbed or coastal environment.

Uses & applications

Commonly used in construction as a building material, road base, or decorative garden stone. Pure quartz sandstone is also used to make glass.

Geological facts

Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum because of its porosity.

Field identification & locations

Identify in the field by its distinctive 'sandpaper' texture. Common in basins and coastal regions. It will often leave a gritty residue if rubbed against a harder surface.