sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to vitreous), conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91. Colors vary widely due to impurities, often showing red, yellow, brown, or green tones.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to vitreous), conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91. Colors vary widely due to impurities, often showing red, yellow, brown, or green tones.
Formation & geological history
Forms from the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling cavities in volcanic rocks over millions of years.
Uses & applications
Commonly used for making decorative items, cabochons, jewelry, carvings, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, and is mentioned in various historical and biblical texts for its protective qualities.
Field identification & locations
Easily identified by its opaque nature, waxy luster, conchoidal fracture, and lack of cleavage. Found worldwide in riverbeds, mountainous regions, and ancient sedimentary deposits.
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