sedimentary

Jasper Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide Impurities

Hardness: 6.5 - 7 on the Mohs scale. Color: Brownish-red to ochre yellow with dark veinlets or bands. Luster: Dull to waxy, smoothed by natural water abrasion. Structure: Microcrystalline, non-cleavable, conchoidal fracture.

Hardness: 6
Color: Brownish-red to ochre yellow with dark veinlets or bands
Luster: Dull to waxy, smoothed by natural water abrasion

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich solutions in sedimentary environments or volcanic cavities, heavily stained by iron oxides. Subsequently weathered and rounded by stream or wave action into a smooth beach or river pebble.

Uses & applications

Used primarily as decorative river rock, tumbling material for lapidary hobbyists, and landscape ornamentation. Larger high-grade pieces are carved or polished into cabochons.

Geological facts

Jaspers obtain their deep red, brown, and yellow hues from varying concentrations of iron oxides like hematite and goethite incorporated during crystallization millions of years ago.

Field identification & locations

Identified by its smooth, rounded river-worn texture, warm reddish-brown earthy coloration, and high hardness (cannot be scratched by a steel pocket knife). Commonly found in riverbeds, gravel pits, and shoreline deposits worldwide.

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