sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, typically brown, red, yellow, or green, trigonal crystal system with a microcrystalline structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, typically brown, red, yellow, or green, trigonal crystal system with a microcrystalline structure, and conchoidal fracture.
Formation & geological history
Forms from the accumulation of silica-rich sediments or volcanic ash, often precipitated from hydrothermal fluids in sedimentary environments over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its opacity, waxy luster, and lack of cleavage. Common worldwide, particularly in areas with ancient volcanic or sedimentary activity.
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