sedimentary

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8

Identified April 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Crystal structure: granular clastic 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 shows signs of iron-oxide staining, suggesting formation in an oxidizing environment like a riverbed or desert.

Uses & applications

Commonly used as a construction material (dimension stone), in glass manufacturing if pure silica is present, and as a reservoir rock for oil and gas.

Geological facts

Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. The varied colors are often due to impurities; iron oxides specifically create the red and brown hues.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. It is common in basin environments worldwide. Collectors often look for unique erosion patterns or fossil inclusions.