sedimentary
Jasper
Silicon Dioxide (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including red, yellow, brown, and green due to iron impurities, vitreous to dull luster, microcrystalline quartz structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including red, yellow, brown, and green due to iron impurities, vitreous to dull luster, microcrystalline quartz structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments, often involving ancient marine oozes or volcanic ash beds, developing over millions of years.
Uses & applications
Commonly used in lapidary arts, ornamental carvings, jewelry, and polished collector specimens.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry, with ancient civilizations valuing it for its strength and protective properties.
Field identification & locations
Can be identified by its opaque nature, smooth waxy polish, conchoidal fracture, and rich earthy colors; found worldwide in riverbeds, ancient marine deposits, and volcanic regions.
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