Moss Agate
Green Moss Agate
A variety of Chalcedony
Uncommon
What is Moss Agate?
Moss Agate is a translucent Agate (a type of Chalcedony) that features a mossy, dendric, branching, or fern-like pattern, thus the name. With these unusual patterns, this semi-precious stone gives an impression of a small landscape or tree captured inside of the stone. Moss Agate makes wonderful tumbled stones and is often used for beads and cabochons.
Optical Properties
- Refractive Index
- 1.530-1.540
- Birefringence
- 0.004
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Discover Values
Rarity
4.1out of 5.0
82%
Popularity
4.0out of 5.0
80%
Beauty
4.4out of 5.0
88%
Cultural Value
4.0out of 5.0
80%
Collection Value
4.3out of 5.0
86%
Moss Agate Market Value Calculator
Estimate the market value of Moss Agate using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Moss Agate Localities Map
See where Moss 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: Moss 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 Moss Agate?
Quick Facts
Physical Properties
- Color
- Green
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.6 g/cm³
- Streak
- Green
- Luster
- Waxy, Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
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