With trace amounts of uranium compounds, this hyalite opal is slightly radioactive and fluoresces under ultraviolet light. "Luminescent hyalite opal" by James St. John. Licensed under CC BY 2.0.
Green Glow in the dark Opal Stone Faceted in Necklace
With trace amounts of uranium compounds, this hyalite opal is slightly radioactive and fluoresces under ultraviolet light. Photo by James St. John. Licensed under CC By 2.0.
Article: Toxic and Radioactive Gems: Safety Tips
Credit: James St. John
| Gemstone | Opal Stone |
| Natural or man made | Natural |
| Jewelry type | necklace |
| Gem State | Faceted |
| Color | Green |
| Transparency | Transparent |
| Photo phenomena | Glow in the Dark |