sedimentary

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish-orange; Luster: Dull, earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown, tan, reddish-orange
Luster: Dull, earthy

Identified April 25, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish-orange; Luster: Dull, earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains, primarily quartz. This specimen is rust-colored due to the presence of iron oxide (hematite or limonite). It typically forms in desert, river, or coastal environments over millions of years.

Uses & applications

Commonly used as a building material, in decorative masonry, for road gravel, and as a source of quartz for glass making. Collectors value pieces with unique banding or iron stains.

Geological facts

Sandstone is often the primary reservoir rock for groundwater, oil, and natural gas. Some of the most iconic landscapes in the world, like the Grand Canyon and Petra, are carved from sandstone.