sedimentary

Sandstone (Ferruginous)

Arenite (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 (grains of quartz/feldspar); Cleavage: None; Specific gravity: 2.22.8

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

Identified May 28, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains of quartz/feldspar); Cleavage: None; Specific gravity: 2.22.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specific specimen shows rounding from water transport in a river or stream environment.

Uses & applications

Used primarily as a construction material (dimension stone), in gravel production, and for manufacturing glass if the quartz content is high. Often used in landscaping.

Geological facts

Sandstone accounts for about 10 to 20 percent of the sedimentary rocks on Earth. The color is usually determined by the impurities in the cementing material, with iron oxides producing the brown seen here.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Commonly found in riverbeds, deserts, and coastal areas. Collectors look for unique weathering or 'Moqui marble' concretions.