sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, colors typically red, brown, yellow, or green due to iron impurities, luster is vitreous to dull, microcrystalline quartz structure with no visible cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors typically red, brown, yellow, or green due to iron impurities, luster is vitreous to dull, microcrystalline quartz structure with no visible cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids replace original material or precipitate in cavities. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone or lapidary material.
Geological facts
Jasper has been used throughout human history since ancient times for seals, drills, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and mountainous regions; identifiable by its conchoidal fracture, high hardness, opaque appearance, and smooth waterworn surfaces in pebbles.
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