gemstone
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from yellow, brown, red to green, vitreous to dull luster, 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, color ranges from yellow, brown, red to green, vitreous to dull luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary or volcanic environments, often through the replacement of organic material or deposition in fissures over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons, jewelry, and as a popular specimen for mineral collectors.
Geological facts
Jasper has been used since ancient times to create seals, signets, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Identified by its opaque appearance, microcrystalline structure, and distinctive patterning or banding; commonly found in hydrothermal veins and sedimentary deposits worldwide.
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