mineral
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
Hardness: 6.5-7 (Mohs); Color: White to greyish-white with green dendritic or moss-like inclusions; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: White to greyish-white with green dendritic or moss-like inclusions; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed through the cooling of silica-rich groundwater in the cavities of volcanic rocks. The green tree-like patterns are caused by manganese or iron oxides, as well as chlorite, infiltrating the cooling agate.
Uses & applications
Primarily used in jewelry making for cabochons and beads, ornamental carvings, and as a popular stone for crystal healing and mineral collecting.
Geological facts
Unlike Moss Agate, Tree Agate is strictly opaque rather than translucent. It is often called the 'Stone of Plentitude' in folklore and has been associated with agriculture and gardening for centuries.
Field identification & locations
Identify by its characteristic 'dendritic' (branch-like) green patterns set against a milky white background. Often found in riverbeds or near ancient volcanic sites in India, Brazil, and the USA.
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