mineral

Tree Agate

Dendritic Agate (Silicon Dioxide - SiO2)

Hardness: 6.5–7 (Mohs scale); Color: White or clear base with forest-green dendritic inclusions; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal (Cryptocrystalline); Cleavage: None; Specific gravity: 2.6–2.7.

Hardness: 6
Color: White or clear base with forest-green dendritic inclusions
Luster: Vitreous to waxy

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed as volcanic rock cools and silica-rich fluids fill cavities and fissures. The green 'tree-like' patterns are caused by manganese and iron oxides trailing into the crystal as it forms. These can be found in volcanic deposits spanning millions of years.

Uses & applications

Predominantly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and 'healing' stone collections.

Geological facts

Unlike 'Moss Agate' which has more mossy-looking filaments, Tree Agate specifically features branching dendritic patterns. In ancient times, it was often buried in fields to encourage a plentiful harvest, hence its name.

Field identification & locations

Identify by its characteristic opaque white chalcedony base with distinct green branching patterns. Primarily found in India, Brazil, and the USA. Collectors should look for high contrast between the white and green and a smooth, vitreous polish.

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