sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness of 6.5 to 7 on the Mohs scale, deep red to brownish-red color, vitreous to dull luster, microcrystalline crystal structure (chalcedony), conchoidal fracture with no true cleavage, and a 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, vitreous to dull luster, microcrystalline crystal structure (chalcedony), conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Red jasper is an opaque, microcrystalline variety of quartz that forms in sedimentary environments or through the hydrothermal alteration of silica-rich rocks, where iron oxide impurities impart its characteristic red color.
Uses & applications
Commonly used in ornamental carvings, cabochons, polished tumbled stones, jewelry making, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times by various civilizations, including the ancient Egyptians who carved it into amulets and seals for protection.
Field identification & locations
Can be identified in the field by its opaque red color, hardness that can scratch glass, and smooth waxy or vitreous polish. It is found worldwide, with major deposits in India, Brazil, Russia, and the USA.
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