mineral

Tree Agate

Chalcedony (SiO2) with Dendritic inclusions

Hardness: 6.5-7 (Mohs); Color: White or clear base with green branching inclusions; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal/Microcrystalline); Specific Gravity: 2.60-2.65.

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

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: White or clear base with green branching inclusions; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal/Microcrystalline); Specific Gravity: 2.60-2.65.

Formation & geological history

Formed in volcanic rocks (lavas) where silica-rich groundwater fills cavities. Transition metal oxides (manganese or iron) seep into the cooling silica and crystallize in branching patterns.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular stone in metaphysical/gemstone collecting.

Geological facts

Unlike Moss Agate, Tree Agate is typically opaque white. The name is derived from the Greek 'agates,' and the 'tree' prefix refers specifically to the green dendrites resembling foliage.

Field identification & locations

Identified by its white opaque chalcedony base and distinctive green branching patterns. Commonly found in India, Brazil, and the USA. Collectors look for sharp, high-contrast patterns.

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