gemstone
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Hardness: 6.5-7 (Mohs), Color: White with green branching inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal (cryptocrystalline), Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: White with green branching inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal (cryptocrystalline), Specific Gravity: 2.58-2.64
Formation & geological history
Formed from volcanic activity where silica-rich groundwater fills cavities in igneous rock, allowing dendritic manganese or iron oxides to grow over millions of years.
Uses & applications
Primarily used for lapidary purposes including cabochons, beads, tumbled stones, and decorative carvings; popular in holistic and metaphysical collecting.
Geological facts
Unlike its close relative Moss Agate, Tree Agate is usually opaque white rather than translucent. The 'tree-like' patterns are not fossilized plants but are mineral dendrites.
Field identification & locations
Identify by its opaque white base and distinct branching green patterns. Commonly found in India, Brazil, and the USA. Collectors look for high contrast between the white and green areas.
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