metamorphic

Iron-stained quartz pebble (probable quartzite)

Quartz (SiO₂), possibly quartzite with hematite/goethite staining

AI-generated identification · may be incorrect

Hardness ~7 Mohs; translucent white to reddish-brown, vitreous to waxy luster, irregular fracture, no obvious cleavage, and typical quartz density near 2.65 g/cm³. The rounded shape indicates natural abrasion or tumbling.

Identified August 31, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely quartz-rich sediment metamorphosed into quartzite, with later iron-oxide staining along fractures; exact geological age and locality cannot be determined from the image. It may also be a weathered quartz vein fragment.

Uses & applications

Common quartzite is used as aggregate, building stone, landscaping material, and occasionally as a decorative specimen. This small piece has minimal commercial value unless locality or unusual inclusions add interest.

Geological facts

Reddish coloration commonly comes from hematite or hydrated iron oxides rather than red quartz. Quartzite generally resists scratching by ordinary steel.

Field identification & locations

Test by scratching glass (quartz should scratch it) and checking for a lack of cleavage; a streak test may leave a white streak, while iron staining can produce a yellow-brown mark. Quartzite occurs worldwide in metamorphic mountain belts.