metamorphic

Jasper and Greenstone Pebble

Siliceous rock / Metamorphic pebble

AI-generated identification · may be incorrect

Hardness of 6.5 to 7 on the Mohs scale, colors ranging from blue-green to brownish-yellow, dull to waxy luster, microcrystalline structure, conchoidal fracture.

Identified August 3, 2026More metamorphic →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, colors ranging from blue-green to brownish-yellow, dull to waxy luster, microcrystalline structure, conchoidal fracture.

Formation & geological history

Formed through regional or hydrothermal metamorphism and subsequent weathering and water-tumble transport in rivers or beaches over thousands to millions of years.

Uses & applications

Used primarily as decorative landscape gravel, in lapidary arts for tumbling and polishing, and by casual rock collectors.

Geological facts

River-tumbled pebbles like this often display mixed mineralogies where quartz-rich jasper veins have intruded into mafic volcanic host rocks before being smoothed by water.

Field identification & locations

Found commonly in stream beds, river gravel bars, and glacial till. Identify by its smooth water-worn shape, high hardness capable of scratching glass, and multicolored mottling.