sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Brown, tan, reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific Gravity: 2.2–2.8

Hardness: 6-7 on Mohs scale
Color: Brown, tan, reddish-brown
Luster: Dull/Earthy

Identified May 17, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Brown, tan, reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular); 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 (clasts) in environments such as deserts, river beds, or beaches. Iron oxides often act as the cementing agent, giving it the brown tint.

Uses & applications

Used primarily as a construction material (dimension stone), in glass making if pure enough, and as a common specimen for educational geological kits.

Geological facts

Sandstone contains a record of the past, often preserving ripple marks, cross-bedding, and even fossils that indicate the flow direction of ancient water currents.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible grains. It is very common globally in sedimentary basins. Look for layering (bedding planes).