sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, colors range from red, brown, yellow to green due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors range from red, brown, yellow to green due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating from ancient marine sediments, spanning various geological ages from Precambrian to Cenozoic.
Uses & applications
Used for ornamental objects, carvings, cabochons, jewelry, and polished display pieces by collectors.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in historical texts as a precious stone.
Field identification & locations
Identified by its opaque appearance, smooth waxy surface when tumbled or waterworn, and characteristic banded or spotted patterns caused by mineral impurities. Found globally in riverbeds, mountainous regions, and desert environments.
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