sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including banded patterns due to impurities, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including banded patterns due to impurities, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, typically deposited in marine environments and chemically altered over millions of years.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.
Field identification & locations
Found worldwide in riverbeds, sedimentary deposits, and volcanic regions. Identified by its opacity and distinctive banding or colors.
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