sedimentary/mineral
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
Hardness: 6.5-7 (Mohs). Color: White or clear base with dark green, branching dendritic patterns. Luster: Vitreous to waxy. Crystal system: Trigonal/Microcrystalline. Specific gravity: 2.60-2.65.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs). Color: White or clear base with dark green, branching dendritic patterns. Luster: Vitreous to waxy. Crystal system: Trigonal/Microcrystalline. Specific gravity: 2.60-2.65.
Formation & geological history
Formed in hydrothermal environments as silica-rich fluids fill cavities in host rocks (often volcanic). The green dendritic patterns are created by manganese or iron oxides, specifically chlorite, seeping into cracks during formation and crystallizing in plant-like patterns.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical practitioners.
Geological facts
Unlike Moss Agate, Tree Agate is usually opaque white rather than translucent. It is often referred to as a Stone of Plenitude due to its historical association with agriculture and garden health.
Field identification & locations
Field identification focuses on the distinct white body with dark green 'branch-like' inclusions that do not form bands like true agate. Commonly found in Brazil, India, and parts of the United States.
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