sedimentary
Green Jasper (River Pebble)
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness of 6.5-7 on the Mohs scale. Dull to waxy luster, opaque greenish hue, microcrystalline cryptocrystalline structure, shell-like (conchoidal) fracture with smooth, water-worn exterior.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Dull to waxy luster, opaque greenish hue, microcrystalline cryptocrystalline structure, shell-like (conchoidal) fracture with smooth, water-worn exterior.
Formation & geological history
Formed via low-temperature silica precipitation in volcanic or sedimentary environments, acquiring its distinct green coloration from chlorite or iron silicates before being eroded and polished into a pebble by stream or beach action.
Uses & applications
Lapidary projects, decorative pebble art, tumbling, wire wrapping, and gemstone collecting.
Geological facts
Green jasper has been carved into tools, seals, and amulets since ancient times. Smooth water-rounded pebbles are prized by tumbling enthusiasts for their uniform texture.
Field identification & locations
Identified by its hard, scratch-resistant surface (scratches glass), opaque matte to waxy green finish, and smooth, egg-like river pebble shape. Commonly found along riverbeds, gravel bars, and ocean beaches worldwide.
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