sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal Structure: Clastic, granular texture; Cleavage: None; Specific Gravity: 2.2-2.8.

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

Identified April 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal Structure: Clastic, granular texture; 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. This specimen appears iron-stained, suggesting oxidation during or after deposition in a terrestrial or shallow marine environment.

Uses & applications

Commonly used in construction for flagstone, paving, and retaining walls. Crushed sandstone is used in road base and glass manufacturing.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth and is a primary aquifer and petroleum reservoir due to its porosity.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. Often found in riverbeds, cliffs, and desert outcrops. It can be scratched by steel but will scratch copper.