sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron oxide impurities, waxy to dull luster, cryptocrystalline or microfibrous crystal structure, conchoidal fracture, and specific gravity of 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 oxide impurities, waxy to dull luster, cryptocrystalline or microfibrous crystal structure, conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Forms primarily as a chemical precipitate in silica-rich aqueous environments, or as a hydrothermal alteration of rocks, often accumulating in sedimentary deposits or as nodules in limestone over millions of years.
Uses & applications
Commonly used in ornamental carvings, cabochons for jewelry, small sculptures, and as a popular specimen for rock collectors.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and weaponry components. Its rich red color is entirely due to iron inclusions dispersed within the silica matrix.
Field identification & locations
Easily identified by its opaque red color, conchoidal fracture, and high hardness which prevents it from being scratched by steel. Found globally in riverbeds, beaches, and mountainous regions.
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