sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency, waxy to dull luster, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency, waxy to dull luster, and conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating from ancient marine deposits and dating back hundreds of millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens.
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 by its opaque reddish-brown color, high hardness, and smooth, water-worn shape when found in riverbeds. Common worldwide.
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