sedimentary

Iron-stained sandstone (likely)

Quartz-rich sandstone, likely stained by iron oxides

AI-generated identification · may be incorrect

Small, rough, reddish-brown fragment with a granular, matte surface. Likely mostly quartz (Mohs 7) cemented by silica, calcite, or iron oxides; grain size and mineral proportions cannot be confirmed from the photo.

Identified October 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Sandstone forms when sand grains are buried, compacted, and cemented; the red color commonly comes from hematite or other iron oxides. The fragment’s age and exact formation cannot be determined visually.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and landscaping material; this small fragment has little commercial value.

Geological facts

Red coloration often develops when iron minerals oxidize in sediment or pore spaces.

Field identification & locations

The Las Vegas area is surrounded by sedimentary rocks, including sandstone, making this identification regionally plausible. A close look at exposed grains or a fresh break would help distinguish sandstone from other iron-stained rocks.