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 dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 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 dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often occurring as nodules or fillings in rock cavities, dating across various geological ages.
Uses & applications
Used widely in ornamental carvings, jewelry, cabochons, and as a decorative stone in lapidary arts.
Geological facts
Jasper has been used since ancient times to create seals, signets, and various decorative items, highly prized by ancient civilizations such as the Greeks, Romans, and Egyptians.
Field identification & locations
Can be identified in the field by its opaque nature, hardness that scratches glass, conchoidal fracture, and characteristic red or earthy color tones. Found globally in riverbeds, mountains, and desert varnish environments.
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