sedimentary

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

AI-generated identification · may be incorrect

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

Identified April 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (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 particles or rock fragments. Often formed in deserts, riverbeds, or coastal environments over millions of years.

Uses & applications

Used primarily as a building material, road base, or in glass manufacturing. Common in landscaping and historical architecture.

Geological facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth and is a major reservoir for groundwater and petroleum.

Field identification & locations

Identify in the field by its 'sandpaper' texture and visible grains. Often displays bedding layers. Commonly found in canyons, beaches, and sedimentary basins.