Mineral

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

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 →

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.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral