sedimentary
Red Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color with dark banding or inclusions, vitreous to dull luster, cryptocrystalline crystal 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 with dark banding or inclusions, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with banded iron formations dating back to the Precambrian era.
Uses & applications
Used in lapidary work, making cabochons, beads, ornamental carvings, and as a popular specimen for mineral collectors.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and weaponry. Its deep red color is primarily due to iron oxide impurities within the quartz matrix.
Field identification & locations
Identified by its deep red color, lack of cleavage, waxy to vitreous luster, and hardness that can scratch glass. Commonly found worldwide, including in India, Brazil, Russia, and the USA.
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