mineral
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 structure with no distinct cleavage, 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 dull luster, cryptocrystalline structure with no distinct cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often during hydrothermal activity, dating from various geological ages.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and various decorative items, highly prized by ancient civilizations such as the Greeks, Romans, and Egyptians.
Field identification & locations
Identified by its opaque nature, conchoidal fracture, high hardness, and smooth water-worn surface when found on beaches or riverbeds. Found worldwide.
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