Opalized Fresh Water Muscle - Coober Pedy

Coober Pedy, located in South Australia, is one of the world’s most famous opal mining regions. It is known for its high-quality opals, including various types like precious opal, opalized fossils, and more.

In this case, the opal has formed naturally in the shape of a freshwater mussel shell. Opalized fossils are a result of organic materials being replaced by opal over millions of years.

The "Fresh Water Muscle Shell" opal likely displays unique opalescent colors and patterns, mimicking the natural texture and appearance of a mussel shell. The opal could show vivid play-of-color, which is a characteristic feature of high-quality opal.