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Boulder Opal Specimen. Dieter Rosenkranz has the most beautiful images of opals I have ever seen on the Internet. You should follow his page.

Incredible colors! Igneous rocks formed from lava flows of the Archaean era (2,700 million years ago) are often found to contain disequilibrium-textured crystals characterized by spherulitic, branching or dendritic morphologies that occur in layers near the flow surface.

gorgeous, natural boulder opal.