sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Mohs hardness of 6.5 to 7. Dull to vitreous or dull-waxy luster. Opaque dark brick-red color due to microcrystalline hematite inclusions. Conchoidal fracture with no cleavage. Microcrystalline (cryptocrystalline) trigonal quartz structure.
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Physical properties
Mohs hardness of 6.5 to 7. Dull to vitreous or dull-waxy luster. Opaque dark brick-red color due to microcrystalline hematite inclusions. Conchoidal fracture with no cleavage. Microcrystalline (cryptocrystalline) trigonal quartz structure.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary or low-grade metamorphic environments, often taking millions of years. Hematite inclusions give it its signature red hue during precipitation.
Uses & applications
Widely used for lapidary art, cabochons, beads, decorative carvings, metaphysical crystals, and landscaping stones.
Geological facts
Red Jasper has been used since ancient times. Ancient Egyptians carved amulets from red jasper to represent the blood of Isis, believing it provided protection and strength.
Field identification & locations
Identified by its distinctive opaque terracotta to deep brick-red color, smooth conchoidal fracture, and inability to be scratched by a steel blade. Commonly found in South Africa, India, Brazil, Australia, and the USA.
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