sedimentary

Iron-stained sandstone

Quartz-rich sandstone with iron-oxide staining (quartz, SiO₂; hematite/goethite, Fe₂O₃/FeO(OH))

AI-generated identification · may be incorrect

A rough, granular, tan-to-rust-colored fragment; likely mostly quartz grains cemented together. Quartz is Mohs 7, with vitreous luster in fresh grains; the rock has no consistent cleavage and variable density.

Identified October 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Sandstone forms when deposited sand is compacted and cemented, commonly in rivers, beaches, or deserts. Iron oxides can stain it during later weathering; its age cannot be determined from the image.

Uses & applications

Ordinary sandstone is used as building stone, paving, and aggregate; attractive pieces may be kept as inexpensive natural-history or landscape specimens.

Geological facts

Rusty orange patches commonly result from iron oxides coating or cementing quartz grains rather than from the rock being metallic.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; iron staining gives the orange-red color. Sandstone occurs worldwide, but the precise locality is unknown from the image.