sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown to reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown to reddish-brown
Luster: Dull/Earthy

Identified July 14, 2026More sedimentary →

Explore Sandstone (Ferruginous) 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 (Mohs scale); Color: Brown to reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral grains, specifically quartz and feldspar, cemented by iron oxides in terrestrial or shallow marine environments.

Uses & applications

Used primarily as a building material, grit for abrasives, or in glass manufacturing if pure; this specific type is often used for decorative paving.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth and is critical for containing groundwater aquifers and petroleum reservoirs.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible individual grains. It is extremely common in desert and plateau regions like the American Southwest.