mineral

Tree Agate (Dendritic Agate/Quartz)

Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions

Hardness: 6.5-7 (Mohs); Color: White to grey-white with green dendritic (tree-like) inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58–2.64

Hardness: 6
Luster: Waxy to vitreous

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich volcanic groundwater that fills cavities (vugs) in igneous rock. The 'tree' patterns occur as manganese or iron oxides crystallize in branching patterns over millions of years.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors and metaphysical practitioners.

Geological facts

Despite its name, Tree Agate is technically not a true 'agate' because it lacks the banding typical of agates; it is a variety of dendritic chalcedony. Historically, it was buried in fields by ancient Greeks to ensure a bountiful harvest.

Field identification & locations

Identify by its characteristic mossy or fern-like green inclusions against a cloudy white translucent background. It is commonly found in India, Brazil, and the USA. For collectors, look for high contrast between the white base and deep green 'branches'.

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