Common and precious opal replaced this bivalve's original shell, making it a spectacular fossil. Opalized fossil bivalve (Bulldog Shale, Lower Cretaceous; Coober Pedy Opal Field, South Australia), photo by James St. John. Licensed under CC By 2.0.
Translucent White Play-of-Color Opal Stone Specimen from Australia
Common and precious opal replaced this bivalve's original shell, making it a spectacular fossil. Opalized fossil bivalve (Bulldog Shale, Lower Cretaceous; Coober Pedy Opal Field, South Australia), photo by James St. John. Licensed under CC By 2.0.
Article: Eight Opal Types Explained
Credit: James St. John
| Gemstone | Opal Stone |
| Natural or man made | Natural |
| Origin | Australia |
| Origin details | Coober Pedy Opal Field, South Australia |
| Gem State | Specimen |
| Color | White |
| Transparency | Translucent |
| Photo phenomena | Play of Color |