mineral

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: White or milky with green tree-like or moss-like inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.65

Hardness: 6
Color: White or milky with green tree-like or moss-like inclusions
Luster: Vitreous to waxy

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic and metamorphic environments where silica-rich groundwater flows through rock cavities. The green coloration comes from trace amounts of chlorite, manganese, or iron oxides forming dendritic patterns over millions of years.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and polished stones; popular in jewelry, as healing crystals, and for ornamental decor.

Geological facts

Despite its name, it is technically a chalcedony rather than a true banded agate. The patterns are mineral inclusions called dendrites, and they do not contain organic plant matter.

Field identification & locations

Identify by its characteristic 'forest-like' green patterns against a milky white background. It is a tough, durable stone that can be found in pebble forms in riverbeds near volcanic areas, particularly in Brazil, India, and the USA.