sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in red, brown, yellow, or green colors due to iron oxide impurities, cryptocrystalline crystal structure, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in red, brown, yellow, or green colors due to iron oxide impurities, cryptocrystalline crystal structure, conchoidal fracture.
Formation & geological history
Forms in sedimentary environments or through the hydrothermal alteration of silica-rich rocks, often precipitating from silica-rich fluids in rock cavities.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used by ancient civilizations since the 4th millennium BC for seals, jewelry, and bows.
Field identification & locations
Identified by its opaque nature, waxy luster, and smooth conchoidal fracture. Commonly found in riverbeds and mountainous regions worldwide.
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