mineral
Tree Agate
Silicon Dioxide with inclusions (SiO2)
Hardness: 6.5-7 Mohs scale. Color: White or clear base with dark green or black fern-like dendrites. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Specific Gravity: ~2.6-2.65.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs scale. Color: White or clear base with dark green or black fern-like dendrites. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Specific Gravity: ~2.6-2.65.
Formation & geological history
Formed as silica-rich water flows through rock cavities and fractures, depositing layers of quartz/chalcedony alongside manganese or iron oxides that form dendritic structures.
Uses & applications
Popular for tumbled stones, decorative carvings, cabochons, metaphysical practices, and gemstone collections.
Geological facts
Tree agate is closely related to moss agate; while moss agate is translucent, tree agate typically features an opaque white base with rich dark green or black inclusions resembling foliage.
Field identification & locations
Identified by its distinctive white ground color with branching green dendritic veins. Commonly sourced from India, Brazil, Uruguay, and the USA.
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