sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, colors range from yellow, brown, red, to green due to iron oxide impurities, waxy to vitreous luster, amorphous or cryptocrystalline crystal 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 yellow, brown, red, to green due to iron oxide impurities, waxy to vitreous luster, amorphous or cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often replacing organic material or filling cracks and cavities over millions of years.
Uses & applications
Used for ornamental carvings, polished stones, cabochons in jewelry, and as a decorative stone.
Geological facts
Jasper has been used by ancient civilizations since antiquity for tools, seals, and ornamentation. It is mentioned in various historical texts as one of the most valued stones of the ancient world.
Field identification & locations
Can be identified in the field by its smooth, water-worn texture, conchoidal fracture, opaque appearance, and resistance to scratching from steel. Found worldwide in riverbeds, marine deposits, and mountainous regions.
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