sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque appearance, and conchoidal fracture without distinct crystal cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque appearance, and conchoidal fracture without distinct crystal cleavage.
Formation & geological history
Formed by the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Used extensively for ornamental carvings, cabochons in jewelry, and decorative lapidary arts.
Geological facts
Jasper has been utilized by ancient human civilizations since prehistoric times for tools, seals, and amulets.
Field identification & locations
Commonly identified by its rich opaque colors and smooth waxy feel, frequently found in riverbeds and glacial drift throughout Minnesota.
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