sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (SiO2 with Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Reddish-brown, tan, or orange; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None

Hardness: 6-7 (Mohs scale)
Color: Reddish-brown, tan, or orange
Luster: Dull/Earthy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Reddish-brown, tan, or orange; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, specifically rich in iron oxide (hematite or limonite) which provides the red coloration. Commonly found in ancient riverbeds, deserts, or marine environments.

Uses & applications

Used primarily as a construction material (dimension stone), in glass making, and as a decorative garden stone. Sometimes used for abrasive purposes.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The red color is a result of the 'rusting' of iron minerals within the sedimentary layer during formation.

Field identification & locations

Identify by its 'sandpaper' texture and visible grains. It can be found globally in outcrop formations and riverbeds. For collectors, look for cross-bedding or fossil features.