sedimentary
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with quartz infill
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, green and brownish color with white/translucent quartz crystal pocket, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.65
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, green and brownish color with white/translucent quartz crystal pocket, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.65
Formation & geological history
Formed through the deposition of silica-rich fluids in fractures and cavities of preexisting rock, typically during hydrothermal activity or low-temperature diagenesis over millions of years
Uses & applications
Commonly collected as a lapidary specimen, used for cabochons, decorative carvings, and jewelry making
Geological facts
Jasper is an opaque variety of chalcedony and has been used since ancient times for seals, signet rings, and ornamentation due to its toughness and ability to take a fine polish
Field identification & locations
Easily identified by its hardness, smooth water-worn surface in river stones, and distinct contrasting quartz-filled vugs or veins; found globally in stream beds, gravel bars, and ancient marine deposits
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