sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown to brown color, opaque luster, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown to brown color, opaque luster, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, often precipitated from hydrothermal solutions or silica-rich fluids in marine or terrestrial sedimentary environments.
Uses & applications
Used for ornamental objects, cabochons, jewelry, carvings, and lapidary art.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and decorative items. It is mentioned in various historical and religious texts for its beauty and perceived protective properties.
Field identification & locations
Easily identified by its opaque nature, hardness, and conchoidal fracture. Commonly found worldwide in riverbeds, sedimentary formations, and hydrothermal veins. Collectors look for unique patterns and colors.
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