sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to iron impurities, and a conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors due to iron impurities, and a conchoidal fracture.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, precipitated in marine environments or hydrothermal veins over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry, mentioned in various historical texts.
Field identification & locations
Identified by its fine-grained texture and opacity; commonly found worldwide in riverbeds, volcanic deposits, and sedimentary layers.
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