mineral
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: White or colorless base with dark green or black branching inclusions; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.60-2.65
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: White or colorless base with dark green or black branching inclusions; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.60-2.65
Formation & geological history
Formed in volcanic rock cavities (vugs) through the cooling of silica-rich solutions. The 'dendrites' are created when mineral-rich water (manganese or iron) seeps into cracks during formation, crystallizing in branching patterns.
Uses & applications
Used primarily in jewelry (cabochons), lapidary art, tumble polishing, and as a collector's stone or metaphysical tool.
Geological facts
Despite the name 'Tree Agate', these are not fossils and contain no organic matter. The term 'dendritic' comes from the Greek word 'dendron', meaning tree, referring to the pattern.
Field identification & locations
Identified by its translucent to opaque white base and characteristic plant-like branching patterns. Found globally, with high-quality specimens coming from India, Brazil, and the USA.
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