sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Brownish-tan to reddish-orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Brownish-tan to reddish-orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. Often formed in river beds, deserts, or marine environments where sand is deposited and cemented by iron oxides over millions of years.

Uses & applications

Used primarily in building and construction, as a decorative stone, and in the manufacturing of glass and grindstones.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The 'iron-rich' brown color in this specific specimen is caused by the presence of hematite or limonite acting as a cementing agent.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible sand grains. Common in arid regions and river basins. Collectors look for unique banding or fossil inclusions.