mineral
Dendritic Agate or Tree Agate
Silicon Dioxide (SiO2) with impurities of manganese or iron oxide
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: White, cream, or gray with black to greenish branch-like inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (Cryptocrystalline), Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: White, cream, or gray with black to greenish branch-like inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (Cryptocrystalline), Cleavage: None
Formation & geological history
Formed through the infiltration of manganese or iron oxides into cracks in white quartz or agate during the cooling process, often in volcanic or sedimentary environments.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone or metaphysical 'stone of plenitude'.
Geological facts
Despite its name, it is technically an agate-like chalcedony but lacks the banding usually found in agates. The term 'dendritic' comes from the Greek word 'dendron' meaning tree.
Field identification & locations
Identify by its translucent to opaque white body with black fern-like patterns. Common locations include Brazil, India, Madagascar, and parts of the USA (Montana, Oregon).
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