sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors with distinctive banding or patterns, and a conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors with distinctive banding or patterns, and a conchoidal fracture.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or volcanic ash, often during ancient hydrothermal activity.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and fracture properties.
Field identification & locations
Identified by its microcrystalline texture, lack of cleavage, waxy luster, and resistance to scratching by steel. Found globally in riverbeds and mountainous regions.
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