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.
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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.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often dating back hundreds of millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components due to its hardness and ability to take a high polish.
Field identification & locations
Easily identified by its opaque nature, smooth conchoidal fracture, and rich earthy colors. Found worldwide in riverbeds, ancient marine deposits, and hydrothermal veins.
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