sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, red to brown color due to iron oxide impurities, waxy luster, and cryptocrystalline structure with conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, red to brown color due to iron oxide impurities, waxy luster, and cryptocrystalline structure with conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often during the Precambrian to Paleozoic eras.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, decorative objects, and occasionally as a gemstone in jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components like arrowheads due to its toughness and fracture properties.
Field identification & locations
Identified by its opaque appearance, smooth waxy texture, and inability to be scratched by a steel knife. Commonly found in river gravels and hydrothermal veins worldwide.
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