sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron oxide impurities, vitreous to dull luster, cryptocrystalline or microcrystalline structure, 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, red to reddish-brown color due to iron oxide impurities, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed by the precipitation of silica from silica-rich solutions in marine or lacustrine environments, often associated with hydrothermal activity or banded iron formations. Can date from various geological eras, frequently Precambrian to Paleozoic.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a decorative stone or healing crystal.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and weaponry components. Its intense red color comes from hematite inclusions.
Field identification & locations
Can be identified in the field by its opaque red color, microcrystalline texture, and distinct conchoidal fracture. Found worldwide, with notable deposits in India, Brazil, Russia, and the United States.
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