sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or green in color, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and 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, red, yellow, or green in color, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary rocks or volcanic ash, where silica-rich fluids replace organic material or fill cavities over millions of years.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a collector's mineral specimen.
Geological facts
Jasper has been used since ancient times for making tools, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Easily identified by its opaque nature, conchoidal fracture, and smooth waxy feel. Found worldwide in riverbeds, sedimentary deposits, and volcanic regions.
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