mineral

Tree Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7.0 (Mohs scale), Color: White base with green dendritic inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.64

Hardness: 6

Identified January 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich groundwater in cavities of igneous rocks. The dendritic green patterns are caused by manganese or iron oxide inclusions during the crystallization process over millions of years.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a popular collector's stone due to its unique patterns.

Geological facts

Unlike 'true' agates, Tree Agate is technically a variety of chalcedony that does not exhibit banding; its name comes from its visual resemblance to foliage or forest scenery.

Field identification & locations

Identify in the field by its characteristic white and green 'mossy' or 'branch-like' patterns; it is primarily found in India, Brazil, and the USA. Collectors look for a high contrast between the opaque white quartz and deep green dendrites.