sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Hardness of 6.5 to 7 on the Mohs scale, deep red to brownish-red color due to iron oxide impurities, waxy to dull luster, cryptocrystalline or microcrystalline structure with conchoidal fracture, specific gravity of 2.58 to 2.91.
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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 to dull luster, cryptocrystalline or microcrystalline structure with conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms in silica-rich aqueous environments, often through the precipitation of silica in sedimentary rocks, hydrothermal veins, or volcanic ash beds, where iron oxide impurities become trapped during crystallization.
Uses & applications
Widely used for ornamental objects, cabochons, beads, carvings, and polished display pieces in lapidary arts as well as a popular specimen for mineral collectors.
Geological facts
Red jasper has been utilized since ancient times for talismans, seals, and jewelry. The ancient Egyptians often carved it into amulets representing the girdle of Isis.
Field identification & locations
Easily identified by its opaque deep red color, conchoidal fracture, and hard scratch resistance (scratches glass). Found worldwide, with notable deposits in India, Brazil, Russia, Australia, and the western United States.
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