sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brown, red, yellow, and green due to mineral impurities, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brown, red, yellow, and green due to mineral impurities, conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or volcanic rocks, often through the replacement of organic material or mineral infilling of fractures.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and decorative objects.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and talismans. It is an aggregate of microgranular quartz and up to 20% foreign materials.
Field identification & locations
Found worldwide in riverbeds, beaches, and mountainous regions. Identified by its opacity, hardness, and waxy to dull luster.
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