sedimentary/metamorphic

Jasper / Quartzite pebble

Silicon dioxide (SiO2) with iron impurities

AI-generated identification · may be incorrect

Hardness 6.5-7 on the Mohs scale, opaque yellow/brown/orange color, waxy to dull luster, cryptocrystalline or granular structure, conchoidal fracture.

Identified August 25, 2026More sedimentary/metamorphic →

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Physical properties

Hardness 6.5-7 on the Mohs scale, opaque yellow/brown/orange color, waxy to dull luster, cryptocrystalline or granular structure, conchoidal fracture.

Formation & geological history

Formed as sedimentary deposits of silica or metamorphosed sandstone, subsequently smoothed and rounded by water transport in rivers or oceans over thousands of years.

Uses & applications

Commonly collected as river stones, used in landscaping, tumbling, and lapidary arts.

Geological facts

The yellow and brown colors are typically caused by iron oxides (like goethite or limonite) present during formation. It has been naturally tumbled to a smooth finish.

Field identification & locations

Easily identified by its hardness (scratches glass), smooth water-worn surface, and lack of cleavage. Commonly found in riverbeds, glacial deposits, and beaches.