Dims: 4.2" x 3.0" x 1.7" (10.7 x 7.6 x 4.3 cm)
Wt: 7.59 oz. (215.2 g)
Coober Pedy(?), Australia
Though I am unsure of the exact locality of this specimen, I do know that it is Australian in origin, probably from Coober Pedy, but possibly from Mintabie. It consists of a section of a layer or crust of Opal that was likely partially exposed to the elements. It is definitely precious Opal, though, as it has a milky-white color and shows considerable iridescence or "fire". Most of this is in the form of "pin-fire", which means that the iridescence occurs in little tiny points of coloration. A cross-section of the piece shows that the pin-fire is in a thick layer, looking like very fine, colorful needles from the side. There are at least three discernable layers visible in the cross-section, and they all show evidence of iridescence. One of these layers shows broader flashes of fire, and there is even a purple glow in one spot. Green, blue, red, violet, and yellow colors are all visible in various areas. All of this is best seen under a bright light, though it is partially visible under normal lighting conditions. The specimen is moderately translucent and has conchoidal textures to most of its surfaces, showing a vitreous luster. One side of the piece is noticeably weathered, and appears to represent part the Opal's natural surface. It is a magnificent piece, and one of the largest that I have seen outside of the Tucson shows.