gemstone
Dendritic Agate
Silicon Dioxide (Chalcedony with manganese or iron oxide inclusions)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7; displays translucent to opaque white or grey background with fern-like or tree-like dark inclusions; waxy to vitreous luster.
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Physical properties
Mohs hardness of 6.5 to 7; displays translucent to opaque white or grey background with fern-like or tree-like dark inclusions; waxy to vitreous luster.
Formation & geological history
Formed by silica-rich groundwater filling cavities in volcanic or sedimentary rocks, where mineral-rich solutions crystallize dendritic patterns over millions of years.
Uses & applications
Widely used in ornamental carvings, cabochons for jewelry, and prized by collectors for its unique landscape-like inclusions.
Geological facts
Often mistakenly called a fossil because of the plant-like dendrites, but the patterns are purely inorganic mineral crystal growths.
Field identification & locations
Identify by the distinctive mossy or arboreal inclusions trapped within translucent chalcedony. Commonly sourced from India, Brazil, and the USA.
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