Tree Agate

Physical Properties

Hardness: 6.5–7 on Mohs scale; Color: White to translucent gray with dark green dendritic (tree-like) inclusions; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & Geological History

Formed from silica-rich groundwater percolating through fissures in volcanic rock. The green 'branch' patterns are created by manganese or iron oxide branching out during the cooling process over millions of years.

Uses & Applications

Predominantly used for lapidary work, jewelry (beads, cabochons), decorative spheres, and meditation/holistic healing practices.

Geological Facts

Despite its name, Tree Agate is technically a variety of chalcedony rather than a true 'banded' agate. It has been used since ancient times as a talisman for bountiful harvests.

Field Identification & Locations

Identify by its lack of banding (unlike moss agate) and its distinct white matrix with opaque green branch-like patterns. Common locations include India, Brazil, and the USA.

Identified on: 4/29/2026

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