Yowah Nut Opal, Cupped for Showing by cobalt123 on Flickr.
This Yowah Nut Opal is more classic of the form that features a central area of crystals: “Yowah Opals come in several forms, the most valuable are crystal centred opal “Nuts”. This information and more can be found online here on the “Opal Addiction” website. The site has wonderful links to show the mining of these rare and large beauties. This image is also added to the “Best Viewed Large” group pool, for the detail, color, irridescence, and pattern is truly striking.