sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and colors ranging from red, brown, yellow, to green due to iron oxide impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and colors ranging from red, brown, yellow, to green due to iron oxide impurities.
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments, or as a secondary filling in volcanic rocks, commonly over millions of years.
Uses & applications
Used for ornamental carvings, polished stones, cabochons in jewelry, and geological specimen collecting.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with mentions dating back to antiquity across various civilizations.
Field identification & locations
Easily identified in the field by its opaque nature, waxy luster, and distinctive multicolored banding or patterns. Found worldwide, particularly in areas with ancient volcanic activity or sedimentary deposits.
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