sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline structure with 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 color due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often accumulating in marine basins or volcanic ash beds over millions of years.
Uses & applications
Commonly used for making ornamental objects, cabochons, carvings, jewelry, and prized by rock collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components. Its opaque nature distinguishes it from translucent chalcedonies like agate.
Field identification & locations
Identified easily by its opaque, earthy appearance and hardness that scratches glass. Found worldwide in riverbeds, desert regions, and mountainous terrain.
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