sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron oxide impurities, amorphous or cryptocrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron oxide impurities, amorphous or cryptocrystalline structure.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often originating from ancient marine deposits.
Uses & applications
Used for ornamentation, lapidary arts, cabochons, beads, and as a decorative stone in interior design.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its name means 'spotted or speckled stone'.
Field identification & locations
Can be identified in the field by its conchoidal fracture, waxy to dull luster, and high hardness which scratches glass. Found worldwide in riverbeds and mountainous regions.
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