sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron impurities, trigonal crystal system with cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron impurities, trigonal crystal system with cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids replace the original material over millions of years in various geological environments.
Uses & applications
Used widely in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and various ornaments. Its name comes from the ancient Greek word for 'spotted stone'.
Field identification & locations
Can be identified by its opaque appearance, waxy luster, and conchoidal fracture. Commonly found in riverbeds, glacial drift, and hydrothermal veins worldwide.
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