sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, opaque brown color, vitreous to dull luster, and microcrystalline trigonal structure with no cleavage.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque brown color, vitreous to dull luster, and microcrystalline trigonal structure with no cleavage.
Formation & geological history
Formed through the silification of sedimentary or volcanic deposits, often precipitated from silica-rich fluids over millions of years.
Uses & applications
Used in lapidary work for cabochons, decorative carvings, and as a popular specimen for mineral collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and fracture resistance.
Field identification & locations
Found worldwide in alluvial stream beds and marine deposits; identify by its smooth waterworn surface, conchoidal fracture, and lack of scratching by steel.
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