mineral

Weathered quartz-rich pebble

Mostly microcrystalline quartz (SiO₂), possibly quartzite or chalcedony with iron-oxide staining

AI-generated identification · may be incorrect

Small rounded, brown-red and whitish specimen with a dull to slightly waxy luster and irregular fractures; likely hardness about 6.5–7 Mohs, no obvious cleavage, and moderate density around 2.6 g/cm³.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally rounded river or gravel pebble formed by abrasion of quartz-rich rock; iron oxides produce the reddish-brown staining. Exact geological age and source cannot be determined from the photograph.

Uses & applications

Generally a common collecting specimen or decorative pebble, with no significant industrial or jewelry value unless cutting reveals attractive agate or jasper patterning.

Geological facts

The pale interior and rusty exterior may indicate quartz/chalcedony containing hematite or limonite. A steel knife should not readily scratch fresh quartz surfaces.

Field identification & locations

Look for glassy or waxy fracture surfaces, lack of cleavage, and resistance to scratching; a streak test, hardness test, and close inspection of translucency would distinguish quartz, chalcedony, jasper, and quartzite. Quartz-rich pebbles are widespread in stream gravels worldwide.