Australian Thunder egg is a one-of-a-kind natural wonder from Queensland, formed over 120 million years ago. These stunning Thunder-eggs are believed to have been created by a unique reaction between gas bubbles and rhyolitic lava flows in a volcanic environment, resulting in a unique and beautiful pattern. As an expert in the industry, I can confirm the authenticity and scientific significance of these rare specimens. Each pair is a tangible piece of geological history, perfect for any collector or enthusiast.