sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, yellow, and red, with a cryptocrystalline structure and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, yellow, and red, with a cryptocrystalline structure and conchoidal fracture.
Formation & geological history
Formed by the precipitation of silica from water in ancient marine environments or silica-rich volcanic ash beds, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Used extensively for ornamental carvings, polished cabochons in jewelry, and decorative stone collecting.
Geological facts
Jasper has been used since ancient times for talismans, seals, and tools due to its toughness and ability to take a high polish.
Field identification & locations
Identify by its opacity, waxy luster, and distinctive banding or color patterns. Commonly found in riverbeds, alluvial deposits, and hydrothermal veins worldwide.
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