sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown, yellow, red, or green, vitreous to dull luster, cryptocrystalline structure, 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, typically brown, yellow, red, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often during ancient hydrothermal activity.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its conchoidal fracture and durability.
Field identification & locations
Found worldwide in riverbeds, sedimentary deposits, and volcanic regions. Can be identified by its opaque nature, hardness, and waxy luster.
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