sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz with iron oxide inclusions
Mohs hardness of 6.5 to 7; deep red, brownish-red, or reddish-brown color; vitreous to dull luster; microcrystalline (cryptocrystalline) crystal structure with conchoidal fracture; specific gravity of 2.60 to 2.91.
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Physical properties
Mohs hardness of 6.5 to 7; deep red, brownish-red, or reddish-brown color; vitreous to dull luster; microcrystalline (cryptocrystalline) crystal structure with conchoidal fracture; specific gravity of 2.60 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often rich in iron oxide which imparts the red color. Commonly associated with ancient marine deposits and volcanic activity.
Uses & applications
Used in ornamental carvings, cabochons, beads, lapidary arts, and as a popular collecting specimen.
Geological facts
Jasper has been used since ancient times by various civilizations for seals, talismans, and jewelry. The red variety was particularly prized by ancient Egyptians who associated it with the blood of Isis.
Field identification & locations
Easily identified by its opaque nature, waxy-to-vitreous luster, high hardness (scratches glass), and distinct deep red color. Commonly found worldwide, especially in riverbeds and regions with ancient volcanic or sedimentary activity.
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