mineral
Tree Agate
Quartz (SiO2) with Chlorite/Hornblende inclusions
Hardness: 6.5-7 on the Mohs scale. Color: White to milky opaque chalcedony with dark green dendritic inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: White to milky opaque chalcedony with dark green dendritic inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.
Formation & geological history
Formed in hydrothermal cavities and volcanic rocks where silica-rich fluids deposit microcrystalline quartz along with iron or manganese oxides and chlorite, forming plant-like dendritic branching inclusions.
Uses & applications
Popular for lapidary work, tumbled stones, jewelry beads, carvings, and ornamental collectibles.
Geological facts
Despite being called an agate, Tree Agate is technically a white chalcedony with dendritic inclusions rather than a banded agate. The tree-like patterns are formed by mineral inclusions resembling ferns or moss.
Field identification & locations
Identified by its characteristic milky white background speckled with dark forest-green, mossy, or tree-like branching inclusions. Commonly found in India, Brazil, Uruguay, and the United States.
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