sedimentary
Red Jasper
Microcrystalline quartz (SiO2) with iron oxide impurities
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron inclusions, vitreous to dull luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, and specific gravity around 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 inclusions, vitreous to dull luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, and specific gravity around 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments or hydrothermal veins, often accumulating in marine deposits where iron-rich silica precipitates and undergoes diagenesis.
Uses & applications
Widely used for ornamental carvings, polished tumbled stones, cabochons in jewelry, and metaphysical practices.
Geological facts
Red jasper has been used since ancient times by various civilizations, including the ancient Egyptians who carved amulets from it for protection and associated it with the blood of Isis.
Field identification & locations
Found worldwide, commonly in countries like India, Brazil, Russia, and the United States. It can be identified by its opaque red color, high hardness that scratches glass, and waxy to vitreous luster when polished.
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