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 oxide impurities, amorphous or cryptocrystalline crystal structure, conchoidal fracture with no true cleavage.
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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 oxide impurities, amorphous or cryptocrystalline crystal structure, conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often accumulating in ancient marine basins over millions of years.
Uses & applications
Used primarily for ornamental carvings, polished cabochons in jewelry, and as a durable decorative stone.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with references dating back to antiquity across Greek, Hebrew, and Egyptian civilizations.
Field identification & locations
Easily identified in the field by its opacity, waxy luster, and colorful patterned surfaces, commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
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