gemstone
Tree Agate
Chalcedony (SiO2) with dendritic inclusions
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, white or clear background with deep green dendritic inclusions, cryptocrystalline crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, white or clear background with deep green dendritic inclusions, cryptocrystalline crystal structure, and conchoidal fracture.
Formation & geological history
Forms in cavities of volcanic and metamorphic rocks through the deposition of silica-rich groundwater containing iron and manganese oxides.
Uses & applications
Widely used in ornamental carvings, polished tumbled stones, beads, and wire-wrapped jewelry.
Geological facts
Despite its common name, tree agate is not a true agate because it lacks the typical concentric banding of agates, instead featuring tree-like fern patterns called dendrites.
Field identification & locations
Easily identified by its distinctive green mossy or dendritic inclusions embedded within a translucent white or colorless chalcedony matrix. Found globally, notably in India, Brazil, and the USA.
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