mineral

Rounded quartz-rich pebble

Likely microcrystalline quartz (chalcedony), possibly a weathered quartz or feldspar pebble

AI-generated identification · may be incorrect

Small, smooth, opaque cream-white pebble with faint yellow staining and a dull to weakly waxy luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s exact texture is unclear from the photo.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as a resistant fragment in an igneous or metamorphic source rock and rounded by stream or beach transport; its geological age cannot be determined visually. Yellow coloration may reflect iron-oxide staining.

Uses & applications

Common material for tumbled stones, crafts, landscaping, and inexpensive collections; jewelry use is possible if it is confirmed as attractive chalcedony or quartz.

Geological facts

The strongly rounded shape indicates abrasion during transport or deliberate tumbling. A steel knife should not scratch quartz, while quartz can scratch ordinary glass.

Field identification & locations

Common in gravel beds, river bars, beaches, and glacial deposits worldwide. Test hardness, streak (white), translucency, and reaction to dilute acid; definitive identification may require a loupe or specific-gravity test.