sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown to reddish-brown in color, waxy to vitreous luster, cryptocrystalline crystal structure, no cleavage with conchoidal fracture, and a specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically brown to reddish-brown in color, waxy to vitreous luster, cryptocrystalline crystal structure, no cleavage with conchoidal fracture, and a specific gravity of 2.60 to 2.65.
Formation & geological history
Forms from silica-rich solutions precipitating in marine or terrestrial environments, often within sedimentary or volcanic rocks, frequently during the Mesozoic or Paleozoic eras.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and historical stone tools.
Geological facts
Jasper has been utilized by humans for thousands of years to create arrowheads, spear points, and decorative amulets due to its ability to hold a sharp edge when fractured.
Field identification & locations
Identified in the field by its distinctive conchoidal fracture, opaque appearance, earthy or rich coloration, and high hardness capable of scratching glass. Found globally.
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