mineral
Rough Chalcedony / Jasper Nodules
Silicon Dioxide (SiO2)
Hardness 6.5-7 on Mohs scale; dull to waxy/resinous luster; yellowish-brown to tan color with patchy translucent regions; microcrystalline structure with conchoidal fracture.
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Physical properties
Hardness 6.5-7 on Mohs scale; dull to waxy/resinous luster; yellowish-brown to tan color with patchy translucent regions; microcrystalline structure with conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich solutions within cavities or fractures of host volcanic or sedimentary rocks at low temperatures.
Uses & applications
Popular among lapidary artists for tumbling, carving, and making cabochons. Also collected as raw geological specimens.
Geological facts
Cryptocrystalline quartz varieties like chalcedony and agate have been used since prehistoric times for making tools and ornamental items due to their hardness and tough texture.
Field identification & locations
Look for a waxy luster, hardness that scratches glass, and a translucent yellowish-brown body beneath a rough matrix. Commonly found in stream beds, desert gravels, and volcanic regions worldwide.
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