sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque brown color, waxy to dull luster, trigonal crystal system with a compact microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque brown color, waxy to dull luster, trigonal crystal system with a compact microcrystalline structure.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used primarily in ornamental carvings, cabochons, jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its opaque appearance, conchoidal fracture, and inability to be scratched by a steel knife. Found worldwide, especially in regions with ancient volcanic or sedimentary activity.
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