igneous and sedimentary

Mixed River Pebbles (including Unakite and Jasper)

Polymineralic geological specimens

AI-generated identification · may be incorrect

Hardness varies between 6 and 7 on the Mohs scale depending on the specific pebble; colors include green, pink, brown, and yellow; luster ranges from dull to waxy; compact cryptocrystalline and phaneritic crystal structures.

Identified August 4, 2026More igneous and sedimentary →

Explore Mixed River Pebbles (including Unakite and Jasper) in the encyclopedia →

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Physical properties

Formation & geological history

Formed through various geological processes including igneous crystallization (for the porphyritic granite/unakite) and sedimentary precipitation (for the chert/jasper), subsequently weathered, transported, and rounded by water action in riverbeds.

Uses & applications

Used in decorative landscaping, tumbling, lapidary arts, and rock collecting.

Geological facts

Water-worn pebbles like these are smoothed by tumbling against other rocks in high-energy river environments over thousands or millions of years.

Field identification & locations

Commonly found in stream beds, glacial tills, and beaches. Collectors identify them by their smooth, rounded surfaces and distinct mineral patterns revealed through weathering.