mineral

Dendritic Agate (Tree Agate)

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

AI-generated identification · may be incorrect

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

Identified July 7, 2026More mineral →

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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.