Olive Opal
A variety of Opal
Uncommon
What is Olive Opal?
Olive Opal is a tradename for an olive-green variety of the well-known precious stone called Opal, which is not a true mineral but a hardened silica gel. Olive Opal is mostly mined in Australia, and just like regular Opal, it is used for beads, cabochons, and tumbled stones, but it's rarely cut into faceted gems.
Optical Properties
- Refractive Index
- 1.37-1.52
- Pleochroism
- None
- Optical Character
- Isotropic
Discover Values
Rarity
4.1out of 5.0
82%
Popularity
3.5out of 5.0
70%
Beauty
4.3out of 5.0
86%
Cultural Value
3.9out of 5.0
78%
Collection Value
4.2out of 5.0
84%
Olive Opal Market Value Calculator
Estimate the market value of Olive Opal using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Olive Opal Localities Map
See where Olive Opal 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
- ⚠️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.
Quick Facts
Physical Properties
- Color
- Green, greenish-yellow, brown
- Hardness (Mohs)
- 5.5 - 6
- Density
- 1.98 - 2.25 g/cm³
- Streak
- White
- Luster
- Vitreous, Waxy, Resinous
- Crystal System
- Amorphous
Chemical Properties
- Chemical Formula
- SiO2 · nH2O
- Elements
- H, O, Si
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