sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Red-brown, tan, and earthy pink; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Red-brown, tan, and earthy pink
Luster: Dull to earthy

Identified May 28, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Red-brown, tan, and earthy pink; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Often formed in arid environments or riverbeds where iron oxides available in water act as a cementing agent causing the red coloration.

Uses & applications

Used primarily as decorative landscaping stone or building material. Crushed sandstone is sometimes used as a flux in manufacturing or for glass sand if it is high in silica.

Geological facts

The red color in this specimen is caused by the presence of iron oxide minerals like hematite coating the individual sand grains. It is a very common sedimentary rock that covers much of the Earth's surface.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible small grains. This specific specimen shows typical stream-rounded edges. Found globally in deserts, riverbeds, and sedimentary basins.