sedimentary

Yellow jasper pebble (possibly iron-stained chert)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

AI-generated identification · may be incorrect

Rounded, opaque yellow-tan pebble with a dull to slightly waxy surface and no visible crystals. Quartz hardness is about 7 Mohs; jasper has no cleavage and a fine-grained, cryptocrystalline structure. The photo alone cannot confirm its exact mineral identity.

Identified October 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a silica-rich sedimentary rock formed by silica deposition or replacement, with yellow color from iron oxides; later rounded by water or tumbling. Its age and specific formation environment cannot be determined from the image.

Uses & applications

Collected as a pebble or lapidary material; jasper is commonly cut and polished for cabochons, beads, and decorative objects.

Geological facts

Jasper and chert are closely related microcrystalline quartz rocks, and color alone does not reliably distinguish them.

Field identification & locations

Look for a uniformly fine texture, opacity, and a very hard surface; a scratch test against glass can help, though it may damage the specimen. Similar pebbles occur in gravel deposits worldwide; the pictured rounded shape could also result from artificial tumbling.