sedimentary

Polished jasper pebble (possible brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining

AI-generated identification · may be incorrect

Opaque, rounded pebble with brown-red and pale gray-white patches; smooth, polished surface and waxy to dull luster. Quartz hardness is about 6.5–7 Mohs; no obvious cleavage. The image does not show enough detail to confirm its exact mineral mixture.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms as silica-rich material that fills or replaces sediment and volcanic rock; iron oxides produce red-brown colors. Its geological age and precise formation environment cannot be determined from appearance alone.

Uses & applications

Used for beads, cabochons, decorative objects, and lapidary collections; this small pebble has little industrial or construction use.

Geological facts

The contrasting patches may reflect brecciation or uneven iron staining, but the photograph cannot establish the texture conclusively.

Field identification & locations

A polished jasper pebble is identified by its opacity, fine texture, and lack of visible grains; a scratch test or close examination of a fresh surface would help distinguish it from other silica-rich stones. Jasper and other river-worn siliceous pebbles are plausible in the Pacific Northwest, but the location is not diagnostic.