sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brown, yellow, red, and grey due to iron 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 grey due to iron impurities, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids replace organic material or fill cavities over millions of years.
Uses & applications
Used in ornamental objects, cabochons, carvings, and jewelry making.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Identified by its opaque nature, smooth waxy polish when tumbled by water, and rich multicolored patterns. Commonly found in riverbeds, beaches, and mountainous regions worldwide.
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