sedimentary
Jasper and Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, waxy to vitreous luster, opaque red and brown zones mixed with translucent quartz/chalcedony, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, opaque red and brown zones mixed with translucent quartz/chalcedony, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the deposition of silica-rich fluids in rock cavities or sedimentary basins, often hydrothermal or low-temperature groundwater deposition over millions of years.
Uses & applications
Commonly used for ornamental carvings, cabochons in jewelry, tumbling, and as a popular specimen for rock collectors.
Geological facts
Red coloration in jasper is typically caused by microscopic hematite inclusions, creating striking contrasts when intergrown with clear or white quartz.
Field identification & locations
Identified by its high hardness (scratches glass), waxy luster, and distinctive mottled red and white coloring. Commonly found in riverbeds, gravel deposits, and hydrothermal veins worldwide.
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