sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
Hardness of 6.5-7 on the Mohs scale, waxy to dull luster, opaque transparency, and conchoidal fracture. Colors range from brown, red, yellow, to green, often displaying mottled, spotted, or banded patterns.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to dull luster, opaque transparency, and conchoidal fracture. Colors range from brown, red, yellow, to green, often displaying mottled, spotted, or banded patterns.
Formation & geological history
Forms from the deposition of silica-rich fluids in sedimentary environments or volcanic ash beds, often over millions of years through the gradual replacement of organic material or mineral infilling.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, spheres, and as a popular specimen for rock tumbling and lapidary work.
Geological facts
Jasper has been used since antiquity for seals, talismans, and jewelry, with ancient civilizations attributing mystical protective properties to it.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and ancient sedimentary formations. Easily identified by its hardness, opacity, waxy luster, and lack of cleavage.
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