Moss Opal
Dendritic Opal
A variety of Opal
What is Moss Opal?
Moss Opal is a type of common opal (not a precious variety) that is highly popular as a tumbled stone. Its popularity comes from its interesting, tree-like or fern-like inclusions of iron or manganese oxide. These inclusions are usually black but can exhibit bluish or gray shades. Thanks to its hardiness, moss Opal is often used in jewelry.
Optical Properties
- Refractive Index
- 1.37-1.52
- Pleochroism
- None
- Optical Character
- Isotropic
Moss Opal Market Value Calculator
Estimate the market value of Moss Opal using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Moss Opal Localities Map
See where Moss Opal is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Color
- White, Black
- Density
- 1.9 - 2.3 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2 · nH2O
- Elements
- H, O, Si
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