sedimentary
Jasper
Cryptocrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brown, yellow, red, and green due to impurities, 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, opaque luster, various colors including brown, yellow, red, and green due to impurities, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions or volcanic ash in sedimentary environments, often precipitated in marine environments or hydrothermal veins.
Uses & applications
Used in ornamental objects, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. It is mentioned in various historical and religious texts.
Field identification & locations
Can be identified in the field by its opacity, waxy luster, and conchoidal fracture. Commonly found in riverbeds and mountainous regions worldwide.
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