Tree Agate
A variety of Chalcedony
Uncommon
What is Tree Agate?
Also known as dendritic agate, tree Agate has been known to humanity since ancient times: It was a favorite carving stone for seals and rings among the ancient Egyptians, and the ancient Greeks would bury this stone to promote plentiful harvests in the coming season. It is named for its foliage-like patterns.
Optical Properties
- Refractive Index
- 1.530-1.543
- Birefringence
- 0.003-0.009
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Discover Values
Rarity
4.0out of 5.0
80%
Popularity
3.8out of 5.0
76%
Beauty
4.2out of 5.0
84%
Cultural Value
4.1out of 5.0
82%
Collection Value
4.2out of 5.0
84%
Tree Agate Market Value Calculator
Estimate the market value of Tree Agate using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Tree Agate Localities Map
See where Tree Agate is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Health & Safety Information
- ⚠️Harm Reason: Tree Agate in powdered form can be toxic due to its Crystalline Silica content.
- ⚠️Physical Toxicity: Quartz, silica, crystalline silica and flint are non-toxic materials, but very fine dust containing quartz, known as respirable crystalline silicon (RCS), can cause serious and fatal lung disease. Lapidaries should exercise caution when cutting silica.
- ⚠️How to prevent the risks of Tree Agate?
Quick Facts
Physical Properties
- Color
- White with green patches
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.6 g/cm³
- Streak
- White
- Luster
- Waxy, Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- O, Si
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