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Fossilized shell opal from Coober Pedy, Australia, is an exquisite variety of opal that forms within the remnants of ancient marine creatures, primarily shell fossils. Coober Pedy is renowned for its opal mines and is often referred to as the "opal capital of the world."

This particular type of opal, known as "shell opal" or "fossilized shell opal," is a result of the replacement of the original organic material (such as shells) by opaline silica over millions of years. The opalization process occurs when silica-rich water permeates through the sedimentary layers, gradually replacing the organic matter with opal.

The opal formed in the shells or within the cavities left by the decomposed shells, resulting in a stunning play of colors and patterns within the fossilized remains. These opals can showcase a range of colors, including blues, greens, reds, and oranges, often with an iridescent and captivating display known as "play-of-color."

Fossilized shell opals from Coober Pedy are highly prized for their unique beauty, rarity, and the intricate patterns created by the fusion of opal with the ancient marine fossils. They are commonly used in jewelry and admired by collectors for their historical and aesthetic value.