Fire Opal
A variety of Opal
Rare
What is Fire Opal?
Fire Opal is a variety of opal that has a bright yellow, red, or orange background. It is known for its striking play of colors. It's a valuable stone, mostly because of its rarity. However, the value depends on its color and appearance. The red varieties are most expensive. This gem is often cut into faceted stones and cabochons.
Optical Properties
- Refractive Index
- 1.370-1.470
- Pleochroism
- None
- Optical Character
- Isotropic
Discover Values
Rarity
4.3out of 5.0
86%
Popularity
4.3out of 5.0
86%
Beauty
4.6out of 5.0
92%
Excellent
Cultural Value
4.1out of 5.0
82%
Collection Value
4.5out of 5.0
90%
Excellent
Perfect for decorative uses and jewelry
This stone excels in beauty, collection value.
Fire Opal Market Value Calculator
Estimate the market value of Fire Opal using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Fire Opal Localities Map
See where Fire 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
- Red, brown-red to brown-orange
- Hardness (Mohs)
- 5.5 - 6.5
- 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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