sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, massive crystal structure with no visible cleavage, and commonly exhibits red, brown, or yellow banding.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive crystal structure with no visible cleavage, and commonly exhibits red, brown, or yellow banding.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often dating back hundreds of millions of years.
Uses & applications
Used primarily in lapidary work for making cabochons, decorative carvings, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness.
Field identification & locations
Identified in the field by its conchoidal fracture, opaque appearance, and high scratch resistance against steel; found worldwide in riverbeds and mountainous regions.
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