sedimentary
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5 to 7 on the Mohs scale, yellow to brownish-yellow color, opaque, waxy to vitreous luster, trigonal crystal system with cryptocrystalline structure, conchoidal fracture with no cleavage, and a specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, yellow to brownish-yellow color, opaque, waxy to vitreous luster, trigonal crystal system with cryptocrystalline structure, conchoidal fracture with no cleavage, and a specific gravity around 2.58 to 2.91.
Formation & geological history
Forms primarily through the silica-rich precipitation in sedimentary environments or hydrothermal alteration of volcanic ash and silica-rich fluids, often over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, decorative objects, and by mineral collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The yellow variety is often associated with the element of fire and historical solar symbolism.
Field identification & locations
Identified by its opaque nature, yellow coloration, waxy luster, and hard conchoidal surfaces. Found worldwide in riverbeds, ancient marine deposits, and volcanic regions.
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