gemstone

Tree Agate

Chalcedony (SiO2)

Hardness of 6.5 to 7 on the Mohs scale. Colors include white, green, and clear, often displaying dendritic or fern-like inclusions of green minerals like chlorite or hornblende. Luster is vitreous to waxy. Crystal structure is trigonal (microcrystalline quartz). Cleavage is none, fracture is conchoidal.…

Identified July 31, 2026More gemstone →

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Physical properties

Formation & geological history

Formed from silica-rich groundwater solutions filling cavities in eruptive rocks or ancient lavas, where green mineral impurities precipitate out to form dendritic, tree-like patterns. Geological age varies widely depending on the deposit location, frequently found in Cenozoic volcanic rocks.

Uses & applications

Commonly used in lapidary arts, tumbled stones, polished cabochons, beaded jewelry, decorative ornaments, and crystal healing collections.

Geological facts

Despite its name, Tree Agate is technically a form of chalcedony rather than a true banded agate, because it lacks the typical concentric banding of agates. The green inclusions resemble plant life, giving it its earthy appearance.

Field identification & locations

Easily identified by its translucent to opaque white base with striking green dendritic inclusions. Found globally in regions with volcanic activity, notably India, Brazil, the USA, and Australia. Collectors prize well-defined dendritic patterns.