mineral

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

AI-generated identification · may be incorrect

Small, irregular pale yellow-orange specimen with a dull to slightly waxy luster and no visible crystal faces; estimated Mohs hardness 6.5–7, but hardness and cleavage cannot be confirmed from the image. Quartz has no cleavage, conchoidal fracture, and specific gravity about 2.65.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally worn fragment formed in silica-rich igneous, metamorphic, or sedimentary rock and later rounded by weathering or transport; the yellow color may result from iron-oxide staining. Geological age is indeterminate.

Uses & applications

Common quartz-rich fragments have little commercial value individually, though quartz is important in glass, ceramics, electronics, abrasives, and construction aggregate.

Geological facts

A steel knife or glass-scratch test can help distinguish quartz from softer yellow minerals, but testing may damage the specimen. The image alone cannot reliably separate quartz, chalcedony, yellow jasper, or a similar iron-stained rock.

Field identification & locations

Common in stream gravels, soils, veins, and weathered rock surfaces worldwide; inspect for translucency, conchoidal fracture, and inability to scratch it with a steel nail. A close-up, locality, translucency, and hardness test would improve identification.