sedimentary

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Crystal structure: Clastic (fragmental); Cleavage: None (fractures around grains)

Hardness: 6-7 (individual grains)
Color: Tan, brown, and grey
Luster: Dull/Earthy

Identified April 10, 2026More sedimentary →

Explore Sandstone (likely Arkosic) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Crystal structure: Clastic (fragmental); Cleavage: None (fractures around grains)

Formation & geological history

Formed from the weathering of granitic rocks followed by the accumulation and cementation of mineral particles (sand size). Typically formed in terrestrial or near-shore environments over millions of years.

Uses & applications

Used primarily in construction as a building material, crushed stone for road bases, and historically for grindstones or architectural carvings.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is a vital reservoir rock for groundwater, oil, and natural gas due to its porosity.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible grains. Often found in layered outcrops or desert environments. This specific specimen shows visible feldspar and quartz grains.