sedimentary
Red Jasper
Silicon dioxide (microcrystalline quartz, $SiO_2$)
Hardness of 6.5 to 7 on the Mohs scale, deep red to brownish-red color due to iron oxide impurities, waxy or vitreous luster, cryptocrystalline structure with no visible cleavage, and a specific gravity of 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, deep red to brownish-red color due to iron oxide impurities, waxy or vitreous luster, cryptocrystalline structure with no visible cleavage, and a specific gravity of 2.65.
Formation & geological history
Formed through the deposition of silica-rich sediments in marine environments, often associated with banded iron formations, undergoing diagenesis and low-grade metamorphism over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, tumbled stones, and decorative landscaping objects.
Geological facts
Red jasper has been used since ancient times for talismans and seals, prized by Egyptians and Native Americans for its strength and protective qualities.
Field identification & locations
Easily identified by its opaque red color, conchoidal fracture, and lack of reaction to acid. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
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