sedimentary

Sandstone (with Iron Staining)

Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, yellowish-brown, or rusty orange; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None (fractures around grains).

Hardness: 6-7 (Mohs scale)
Color: Tan, yellowish-brown, or rusty orange
Luster: Dull or earthy

Identified July 12, 2026More sedimentary →

Explore Sandstone (with Iron Staining) 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: Tan, yellowish-brown, or rusty orange; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None (fractures around grains).

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The yellowish-brown hue suggests oxidation of iron-rich minerals (chemical weathering) and exposure to moisture.

Uses & applications

Commonly used in construction, road base materials, and as an architectural building stone. High-purity sandstone is a source of silica for glassmaking.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The distinct coloring in this specimen is likely due to the presence of goethite or limonite, which act as a natural 'rust' dye for the rock.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. It is extremely common worldwide in sedimentary basins. Collectors should look for unique layering or fossils often trapped within these strata.