Boulder Opal Specimen
Displaying a rich tapestry of colors, flashes of indigo, green, orange and yellow are seen in the opal veining in this superlative boulder opal specimen. Originally begun as a nodule, over time, mineral-bearing waters, rich with the silica and iron that form opal, seeped in to fill the voidsforming a "pool of opal" inside the large concretion. When the concretion dried, voids and cracks formed inside the ironstone created the interesting veining seen here. The exposed opal has a natural polish without any enhancement or interference by man, giving it a vitreous surface luster.
Measures 5 ½ x 3 ¼ x 1in