sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including green, brown, red, and yellow, microcrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including green, brown, red, and yellow, microcrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash deposits.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a collector specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name comes from the Greek word iaspe, meaning 'spotted stone'.
Field identification & locations
Can be identified by its opaque nature, lack of cleavage, waxy to dull luster, and multicolored or patterned appearance. Found worldwide in riverbeds and mountainous regions.
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