sedimentary

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Brown to dark gray, rough and dull, with a contrasting yellow-tan vein or mineral-filled fracture. Hardness and crystal structure cannot be determined visually; the vein may be quartz or a softer mineral such as calcite.

Identified September 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when mineral-rich fluids filled a crack in the host rock, followed by iron oxidation and staining. The rock’s age and precise formation environment cannot be established from the photograph.

Uses & applications

Small specimens are mainly collected for their contrasting vein patterns; iron oxides are also used as pigments and iron ores, while quartz has many industrial uses.

Geological facts

The pale stripe appears to follow a fracture, a common way mineral veins form. A hardness test or acid test on a fresh surface could help distinguish quartz from calcite.

Field identification & locations

Look for the same color and texture on a fresh break; quartz scratches glass, whereas calcite is softer and fizzes in dilute acid. The host rock and locality are needed for a reliable identification.