sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale. Colors vary widely including brown, red, yellow, and green due to impurities. It has a waxy to dull luster and a cryptocrystalline crystal structure with conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale. Colors vary widely including brown, red, yellow, and green due to impurities. It has a waxy to dull luster and a cryptocrystalline crystal structure with conchoidal fracture.
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often during ancient hydrothermal activity.
Uses & applications
Used primarily in lapidary arts, making ornamental carvings, beads, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry tools like arrowheads due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its opaque appearance, hardness scratching glass, and lack of cleavage. Commonly found in riverbeds, desert varnish regions, and ancient marine deposits worldwide.
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