Mineral

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs); Color: White or clear base with green branching inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64

Hardness: 6
Color: White or clear base with green branching inclusions
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

Explore Tree Agate in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the cooling of silica-rich fluids in volcanic rock cavities. The green 'branching' patterns are caused by manganese and iron oxide inclusions that seep into the fissures of the quartz during formation.

Uses & applications

Primary uses include ornamental carvings (like the mushroom shown), jewelry (cabochons), and as a popular specimen for crystal healing and mineral collectors.

Geological facts

Despite the name, tree agate does not contain organic matter or fossilized wood; the patterns are purely mineral-based dendrites. It was traditionally known as a 'stone of plenty' in agricultural cultures.

Field identification & locations

Identify by its distinct forest-green 'moss-like' or 'branch-like' inclusions on a white chalcedony base. Commonly found in India, Brazil, and parts of the USA. It is often confused with Moss Agate, which is more translucent.