sedimentary
Jasper
Microcrystalline Quartz (SiO2 with iron oxide impurities)
Hardness of 6.5 to 7 on the Mohs scale, colors ranging from red, brown, yellow to green, opaque luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.55 to 2.70.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors ranging from red, brown, yellow to green, opaque luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.55 to 2.70.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing organic material or filling cavities in volcanic rocks over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, decorative objects, and as a polishing stone.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools. Its name comes from the Greek word iaspe, meaning spotted stone.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and sedimentary deposits. Easily identified by its opacity, smooth waxy polish when tumbled, and rich earthy color patterns.
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