metamorphic

Weathered river pebble (likely iron-stained quartzite)

Quartz-rich quartzite; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Rounded, fine-grained, yellow-brown to greenish surface with a dull, weathered luster. Quartzite is mainly quartz (SiO₂), Mohs hardness about 7, with no prominent cleavage; iron oxides or other minerals may cause the coloration.

Identified September 26, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz-rich sandstone recrystallized under heat and pressure, then weathered and rounded during transport in water. Its age and original location cannot be determined from the image.

Uses & applications

A common decorative or collecting pebble; quartzite is also used as aggregate, paving, and building stone.

Geological facts

Iron-oxide staining can produce yellow-brown hues, while green patches may reflect other minerals or surface staining.

Field identification & locations

Its smooth, rounded shape suggests water transport, but texture and a hardness test would help distinguish quartzite from other pebble rocks. Quartzite occurs worldwide; no specific locality is identifiable here.