sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz variety
Hardness of 6.5 to 7 on the Mohs scale, multicolored with reds, yellows, and browns due to iron inclusions, vitreous to dull luster, cryptocrystalline structure with conchoidal fracture, and a specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, multicolored with reds, yellows, and browns due to iron inclusions, vitreous to dull luster, cryptocrystalline structure with conchoidal fracture, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich solutions in sedimentary environments or volcanic ash beds, often in ancient marine or lacustrine settings.
Uses & applications
Commonly used for ornamental carvings, cabochons in jewelry, and as a popular specimen for rock tumbling and lapidary arts.
Geological facts
Jasper has been used since ancient times to create seals, signets, and intricate talismans, and is frequently mentioned in historical texts regarding ancient jewelry.
Field identification & locations
Easily identified by its opaque nature and multicolored banding or patterns, found worldwide in riverbeds, ancient gravel deposits, and mountainous regions.
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