sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brownish-gray color with lighter quartz inclusions, waxy to vitreous luster, conchoidal fracture, and specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brownish-gray color with lighter quartz inclusions, waxy to vitreous luster, conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often weathered and water-worn into a smooth pebble over geological time scales.
Uses & applications
Commonly used in lapidary arts, tumbled stones, ornamental carvings, jewelry making, and as a collector specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone' in Greek.
Field identification & locations
Found worldwide in riverbeds, beaches, and glacial deposits. Identify by its hardness, lack of cleavage, and smooth water-worn texture with opaque coloration.
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