sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
Mohs hardness of 6.5 to 7; opaque red, brownish-red, or terracotta color; waxy to vitreous luster; microcrystalline quartz crystal structure; conchoidal fracture with no cleavage; specific gravity of 2.58 to 2.91
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Physical properties
Mohs hardness of 6.5 to 7; opaque red, brownish-red, or terracotta color; waxy to vitreous luster; microcrystalline quartz crystal structure; conchoidal fracture with no cleavage; specific gravity of 2.58 to 2.91
Formation & geological history
Forms in sedimentary environments through the accumulation of silica-rich sediments and radiolarian oozes, or as a primary chemical precipitate in marine environments, often associated with hydrothermal activity and iron-rich volcanic environments.
Uses & applications
Widely used in ornamental carvings, cabochons, polished tumbled stones, jewelry, and as a collector specimen.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and weaponry components. Its intense red coloration comes from hematite and clay impurities trapped within the microcrystalline quartz matrix.
Field identification & locations
Easily identified by its opaque red color, hardness that can scratch glass, and smooth waxy finish when polished. Commonly found in riverbeds, hydrothermal veins, and sedimentary deposits worldwide.
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