mineral

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Hardness: 6.5–7 on Mohs scale; Color: White to grey with green branching inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58–2.64.

Hardness: 6
Color: White to grey with green branching inclusions
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of manganese or iron oxides into fissures within chalcedony. The green 'moss' or 'tree' patterns are typically chlorite or hornblende inclusions. Found in volcanic environments where mineral-rich water flows through rock cavities.

Uses & applications

Primarily used in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors and metaphysical practitioners.

Geological facts

Despite the name, tree agate does not contain fossilized organic matter; the patterns are purely mineral growth called dendrites. It is often associated with themes of inner peace and abundance in folklore.

Field identification & locations

Identify in the field by its translucent white body and distinct green dendritic (branch-like) inclusions. It will easily scratch glass but cannot be scratched by a steel knife. Commonly found in Brazil, India, and the USA.