sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7; varies in color from red, yellow, to brown due to iron impurities; vitreous to dull luster; cryptocrystalline structure with conchoidal fracture.
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Physical properties
Mohs hardness of 6.5 to 7; varies in color from red, yellow, to brown due to iron impurities; vitreous to dull luster; cryptocrystalline structure with conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica from water or silica-rich volcanic ash, often in marine or lacustrine environments.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, cabochons, and as a semi-precious gemstone.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative tools due to its durability and rich coloration.
Field identification & locations
Identified easily by its opaque nature, waxy luster, and lack of cleavage; commonly found in riverbeds and mountainous regions worldwide.
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