sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to brownish-red color due to iron inclusions, waxy to dull luster, cryptocrystalline structure with 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, red to brownish-red color due to iron inclusions, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often accumulating in marine basins or volcanic ash beds over millions of years.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, and decorative landscaping stones.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components like arrowheads due to its toughness and ability to take a high polish.
Field identification & locations
Can be identified in the field by its opaque reddish appearance, conchoidal fracture, and inability to be scratched by a steel knife. Found worldwide in riverbeds, beaches, and mountainous regions.
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