sedimentary
Botryoidal Chalcedony on Chert
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and a botryoidal (grape-like) crystal habit with grayish-white coloration.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and a botryoidal (grape-like) crystal habit with grayish-white coloration.
Formation & geological history
Formed through the low-temperature deposition of silica-rich groundwater in cavities within sedimentary host rocks, typically over millions of years.
Uses & applications
Used primarily as a decorative mineral specimen for collectors, in lapidary arts for cabochons, and for ornamental displays.
Geological facts
Botryoidal growth forms when microcrystalline silica gels precipitate simultaneously from solution around multiple nucleation points.
Field identification & locations
Identify in the field by its distinct grape-like rounded texture combined with the extreme hardness of quartz. Commonly found in limestone and chert nodules worldwide.
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