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, cryptocrystalline structure with conchoidal fracture, and specific gravity around 2.65.
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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, cryptocrystalline structure with conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Formed through the hydrothermal deposition of silica-rich fluids or the accumulation of silica-rich radiolarian ooze, often in marine environments, with iron oxides imparting the characteristic red color.
Uses & applications
Commonly used in lapidary arts, ornamental carvings, cabochons for jewelry, and as a collector specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Red jasper is specifically mentioned in various historical texts for its grounding properties.
Field identification & locations
Easily identified by its opaque red color, waxy to dull luster, and characteristic conchoidal fracture. Found worldwide in association with iron ore deposits and ancient seabed formations.
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