sedimentary

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs). Color: Tan to reddish-brown with dark iron/manganese oxidization. Luster: Dull/Earthy. Texture: Granular/Sand-like. Cleavage: None.

Hardness: 6-7 (Mohs)
Color: Tan to reddish-brown with dark iron/manganese oxidization
Luster: Dull/Earthy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs). Color: Tan to reddish-brown with dark iron/manganese oxidization. Luster: Dull/Earthy. Texture: Granular/Sand-like. Cleavage: None.

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments of sand size, typically in river, desert, or marine environments. The dark patches indicate secondary mineral staining by iron or manganese oxides.

Uses & applications

Commonly used as a building material, in the manufacture of glass (if pure quartz), and as an abrasive in industrial tools.

Geological facts

Sandstone makes up about 10-25% of the sedimentary rock on Earth. It is a major aquifer for ground water and a primary reservoir for petroleum deposits.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible grains. Often displays bedding planes or cross-bedding. Look for it in arid regions or exposed cliff faces.