mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: White, cream, or translucent gray with dark inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.58–2.64
- Hardness
- 6
- Color
- White, cream, or translucent gray with dark inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: White, cream, or translucent gray with dark inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.58–2.64
Formation & geological history
Formed as a secondary mineral in volcanic or metamorphic rocks when silica-rich water fills cavities. The dendritic patterns are created by mineral oxides (manganese or iron) crystallizing in tree-like patterns into the cooling silica gel.
Uses & applications
Used primarily in jewelry, lapidary arts (cabochons), and as focus stones for meditation and crystal healing.
Geological facts
Also known as the 'Stone of Plenitude'. Although called an agate, it is technically a chalcedony since it often lacks the concentric banding required to be a true agate. The 'trees' are purely mineral and not ancient plant life.
Field identification & locations
Identify by its plant-like dark branch patterns against a translucent or white chalcedony background. Found commonly in Brazil, India, Madagascar, and the USA. Collectors look for high contrast and clear botanical-like patterns.
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