Mineral
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs); Color: White or clear base with green branching inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64
- Hardness
- 6
- Color
- White or clear base with green branching inclusions
- Luster
- Vitreous to waxy
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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: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.64
Formation & geological history
Formed through the cooling of silica-rich fluids in volcanic rock cavities. The green 'branching' patterns are caused by manganese and iron oxide inclusions that seep into the fissures of the quartz during formation.
Uses & applications
Primary uses include ornamental carvings (like the mushroom shown), jewelry (cabochons), and as a popular specimen for crystal healing and mineral collectors.
Geological facts
Despite the name, tree agate does not contain organic matter or fossilized wood; the patterns are purely mineral-based dendrites. It was traditionally known as a 'stone of plenty' in agricultural cultures.
Field identification & locations
Identify by its distinct forest-green 'moss-like' or 'branch-like' inclusions on a white chalcedony base. Commonly found in India, Brazil, and parts of the USA. It is often confused with Moss Agate, which is more translucent.
