sedimentary
Dendritic Agate
Chalcedony with manganese or iron oxide inclusions (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, translucent to opaque white or gray base with fern-like dendritic inclusions, waxy to vitreous luster, and microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, translucent to opaque white or gray base with fern-like dendritic inclusions, waxy to vitreous luster, and microcrystalline structure.
Formation & geological history
Formed by silica-rich groundwater filling cavities in volcanic or sedimentary rocks, where mineral-rich solutions precipitate fern-like dendrites.
Uses & applications
Used extensively in jewelry, ornamental carvings, and as a popular collectible specimen.
Geological facts
Often mistakenly called tree agate due to its plant-like patterns, though the inclusions are purely mineral dendrites.
Field identification & locations
Easily identified by its distinct branching dark inclusions within translucent chalcedony; commonly found in India, Brazil, and the USA.
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