sedimentary
Jasper / Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque to translucent, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque to translucent, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the deposition and consolidation of silica-rich sediments or volcanic ash in marine or terrestrial environments, later weathered and water-worn into a pebble.
Uses & applications
Used in lapidary arts for making cabochons, beads, decorative carvings, and as tumbling stones.
Geological facts
Jasper is an ancient gemstone mentioned in various historical and biblical texts, prized since antiquity for seals, talismans, and ornamentation.
Field identification & locations
Identified by its microcrystalline structure, hardness capable of scratching glass, and lack of visible crystal grains. Commonly found in riverbeds, beaches, and glacial till worldwide.
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