gemstone
Dendritic Agate
Silicon dioxide with manganese or iron oxide inclusions (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Displays translucent to milky-white chalcedony with striking fern-like or tree-like dark manganese inclusions. It features a waxy to vitreous luster and a conchoidal fracture.
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Physical properties
Mohs hardness of 6.5 to 7. Displays translucent to milky-white chalcedony with striking fern-like or tree-like dark manganese inclusions. It features a waxy to vitreous luster and a conchoidal fracture.
Formation & geological history
Forms when mineral-rich water solutions seep through tiny cracks and cavities in igneous or sedimentary rocks, depositing silica and manganese oxides over millions of years.
Uses & applications
Extensively used in lapidary arts, high-end jewelry, cabochons, and prized as a collector specimen.
Geological facts
Despite the name, dendritic agates do not actually have concentric ring bands characteristic of true agates, making them technically a form of dendritic chalcedony.
Field identification & locations
Identify by its translucent base hosting distinct, branching black or brown dendritic patterns resembling plant growth. Found globally, notably in India, Brazil, and the USA.
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