mineral
Chalcedony with Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, color ranges from greyish-white to pale purple and translucent hues, waxy to vitreous luster, cryptocrystalline crystal structure, no distinct cleavage, specific gravity of approximately 2.60 to 2.65
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Physical properties
Hardness of 7 on the Mohs scale, color ranges from greyish-white to pale purple and translucent hues, waxy to vitreous luster, cryptocrystalline crystal structure, no distinct cleavage, specific gravity of approximately 2.60 to 2.65
Formation & geological history
Formed through the deposition of silica-rich aqueous solutions in cavities and fractures of rocks, commonly associated with volcanic or sedimentary environments
Uses & applications
Used for lapidary work, ornamental carvings, cabochons, and as mineral specimens for collectors
Geological facts
Chalcedony is a microcrystalline variety of quartz that includes famous sub-varieties like agate, jasper, and onyx. Specimens often show botryoidal or drusy quartz crystal coatings on the surface.
Field identification & locations
Can be identified by its waxy luster, conchoidal fracture, and lack of visible crystal grains to the naked eye. Commonly found worldwide in volcanic rock cavities, gravel beds, and riverbeds.
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