sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency with a dull to greasy luster, trigonal crystal system with a microcrystalline structure, and conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency with a dull to greasy luster, trigonal crystal system with a microcrystalline structure, and conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the accumulation and silica-replacement of fine-grained sediment or volcanic ash rich in silica, often precipitated in marine or hydrothermal environments. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Used primarily in ornamental carvings, cabochons, jewelry, and lapidary arts as well as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The ancient Greeks and Romans valued various types of jasper for protective properties.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy or dull luster, opaque appearance, and distinct reddish or multi-colored patterns. Found worldwide in regions with past volcanic or sedimentary hydrothermal activity.
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