sedimentary
Jasper
Silicon dioxide (SiO2) microcrystalline quartz
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, featuring mottled yellow and dark gray colors with a compact microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, featuring mottled yellow and dark gray colors with a compact microcrystalline structure.
Formation & geological history
Forms from the deposition of silica-rich fluids or radiolarian ooze in marine environments, often associated with hydrothermal activity or ancient sea beds.
Uses & applications
Widely used for cabochons, beads, decorative carvings, and as a popular ornamental gemstone for collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry, prized for its durability and intricate natural patterns.
Field identification & locations
Identify it by its waxy luster, hardness that scratches glass, and inability to be easily scratched by a steel knife. Commonly found in stream beds and alluvial deposits worldwide.
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