sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 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 with no distinct cleavage.
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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 with no distinct cleavage.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with volcanic activity, and can be millions to billions of years old.
Uses & applications
Commonly used for ornamental carvings, cabochons, lapidary arts, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone' and originates from ancient languages.
Field identification & locations
Identified easily by its opaque, colorful appearance (often red or brown), conchoidal fracture, and hard quartz composition. Found worldwide in riverbeds, glacial tills, and ancient seabeds.
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