sedimentary

Iron-stained sandstone

Quartz-rich sandstone, chiefly SiO₂, cemented by iron oxides

AI-generated identification · may be incorrect

Tan to rusty brown, rough and granular with visible sand-sized grains; quartz is Mohs 7, but the rock’s hardness varies with cement. No obvious cleavage; typically dull to earthy luster and variable density.

Identified October 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, buried, and cemented; iron-oxide staining developed during weathering or groundwater circulation. The image alone cannot determine its geological age.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and sometimes decorative stone; this rough fragment has little obvious commercial value.

Geological facts

Rust-colored patches commonly result from hematite or goethite coating or cementing quartz grains.

Field identification & locations

Look for gritty texture and individual sand grains; a fresh break may reveal grains more clearly. Sandstone occurs worldwide in sedimentary basins; this specimen’s location is unknown.