sedimentary
Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, multicolored with prominent orange/red spots (jasper) and translucent whitish quartz, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, multicolored with prominent orange/red spots (jasper) and translucent whitish quartz, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.60 to 2.65.
Formation & geological history
Formed through the precipitation of silica-rich fluids within rock cavities or as detrital grains transported and rounded by water action in riverbeds and beaches over millions of years.
Uses & applications
Used primarily in lapidary arts for tumbling, cabochons, ornamental carvings, and by mineral collectors.
Geological facts
Jasper varieties have been used since ancient times for talismans, seals, and jewelry. The bright orange spots are typically due to iron oxide inclusions.
Field identification & locations
Commonly found in stream gravels and beaches worldwide. Identify in the field by its hardness, inability to be scratched by a knife, smooth water-worn shape, and waxy luster.
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