sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, typically opaque with various earthy red, brown, yellow, or green colors due to iron oxide impurities, vitreous to dull luster, and conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, typically opaque with various earthy red, brown, yellow, or green colors due to iron oxide impurities, vitreous to dull luster, and conchoidal fracture.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal conditions, often replacing organic material or filling fractures in existing rocks.
Uses & applications
Used for making jewelry, ornamental carvings, decorative objects, and lapidary work.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and decorative items. Red jasper gets its vibrant color from high concentrations of iron.
Field identification & locations
Can be identified in the field by its waxy to dull luster, conchoidal fracture, and inability to be scratched by a steel knife. Common worldwide in riverbeds and ancient marine deposits.
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