sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, color ranges from red, brown, yellow to green, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, color ranges from red, brown, yellow to green, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity around 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica from water rich in silica, often associated with hot springs or volcanic activity, accumulating in marine sedimentary environments over millions of years.
Uses & applications
Used primarily in ornamental carvings, polished stones, cabochons for jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for creating seals, talismans, and jewelry, referenced in various historical and religious texts.
Field identification & locations
Identified by its opaque appearance, smooth water-worn texture when found in riverbeds, conchoidal fracture, and inability to be scratched by a steel knife.
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