sedimentary

Sandstone with Iron Oxide Staining

Arenite with Limonite/Hematite alteration

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8

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

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); 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, typically in river, desert, or marine environments. The reddish-brown coloration is due to the oxidation of iron minerals (weathering).

Uses & applications

Commonly used as a building material, in the manufacture of glass, and for decorative landscape stones. Iron-rich versions were historically used as low-grade pigments (ochre).

Geological facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. The distinct layering or staining can record ancient climate changes and environmental transitions.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible layering. It is commonly found in sedimentary basins and canyonlands. Collectors look for unique banding or fossil inclusions.