sedimentary

Weathered iron-rich sandstone or ironstone pebble

Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz, with softer weathered areas; tan, reddish-brown, and gray, dull to earthy luster, granular texture, and no obvious cleavage. The rounded shape indicates abrasion, likely in a stream or beach environment.

Identified September 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was lithified and later impregnated or stained by hematite and goethite during oxidation; the exact geological age cannot be determined from the image. Surface rounding reflects transport and weathering.

Uses & applications

Commonly used as aggregate, paving, or building stone when present in large quantities; this small specimen has little industrial or jewelry use.

Geological facts

Iron oxides produce the rusty red-brown coloration and may form dark nodules or thin veins. A streak test, acid test, and fresh-surface examination would improve identification.

Field identification & locations

Look for visible sand grains, reddish-brown iron staining, and a nonmetallic earthy appearance; common in sedimentary terrains worldwide. It is likely weakly magnetic or nonmagnetic unless magnetite is present.