sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, conchoidal fracture, and colors ranging from brown, red, yellow, to green.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, conchoidal fracture, and colors ranging from brown, red, yellow, to green.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used for ornamental carvings, jewelry, lapidary art, and as a decorative stone.
Geological facts
Jasper has been used since ancient times to create seals, signets, and various ornaments. Its name means 'spotted or speckled stone'.
Field identification & locations
Can be identified by its opaque nature, waxy luster, and inability to be scratched by a steel knife. Commonly found worldwide in riverbeds and mountainous regions.
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