sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, and yellow, cryptocrystalline crystal structure, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, and yellow, cryptocrystalline crystal structure, conchoidal fracture.
Formation & geological history
Formed from silica-rich sediments or volcanic ash that underwent diagenesis and hydrothermal alteration, commonly found in riverbeds and marine beaches due to water tumbling.
Uses & applications
Used in lapidary arts, ornamental carvings, jewelry making, and as a collector's specimen.
Geological facts
Jasper has been used throughout human history since ancient times for talismans, seals, and decorative tools.
Field identification & locations
Can be identified by its waxy luster, hardness that scratches glass, and smooth rounded edges from water wear. Found globally in alluvial deposits.
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