sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, trigonal crystal system, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, trigonal crystal system, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine sediments over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. Ancient civilizations valued it for its strength and protective qualities.
Field identification & locations
Easily identified by its opaque appearance, hardness that scratches glass, and smooth conchoidal fracture. Found worldwide in riverbeds, mountainous regions, and ancient sea beds.
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