sedimentary
Iron-oxide-stained sandstone
Quartz-rich sandstone, likely cemented by iron oxides (hematite/goethite)
AI-generated identification · may be incorrectRough, granular, tan to rusty brown; likely mostly quartz (Mohs 7) with iron-oxide cement. The specimen is too weathered and small to determine grain size or precise composition from the image.
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Physical properties
Rough, granular, tan to rusty brown; likely mostly quartz (Mohs 7) with iron-oxide cement. The specimen is too weathered and small to determine grain size or precise composition from the image.
Formation & geological history
Formed as sand deposited and compacted, then cemented by silica or iron oxides; its age and original depositional setting cannot be determined from appearance alone.
Uses & applications
Sandstone is used as building and paving stone, aggregate, and a source of silica; this small weathered piece is mainly a field or display specimen.
Geological facts
Rusty coloration commonly comes from iron oxides coating grains or filling pore spaces.
Field identification & locations
Look for visible sand-sized grains and a gritty texture; iron-rich staining distinguishes it from clean, pale quartz sandstone. Sandstone occurs worldwide, but a specific locality cannot be identified from the photograph.
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