sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, reddish-brown, grey
Luster: Dull/Earthy

Identified July 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and compaction of sand-sized mineral grains or rock fragments. The reddish-brown staining suggests the presence of iron oxide (hematite or limonite) as a cementing agent or coating.

Uses & applications

Used primarily as a building material, road base, or in the manufacturing of glass and ceramics when high in silica.

Geological facts

Sandstone is one of the most common sedimentary rocks in the Earth's crust. It often preserves fossils and sedimentary structures like ripple marks or cross-bedding from ancient environments.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible grains. Commonly found in desert environments, river beds, and coastal basins.