Australite

Tektites found in Australia and are part of the Australasian Tektite Field, a region extending as far as Sri Lanka to the West, Tasmania Australia to the South, Philippines to the East and Southern China to the North. Australites were deposited 0.79 Ma ago by a massive impact that rained molten glass over the region. The most sought after Australites are round or oval buttons that have been ablated on one side yielding a flange of melted glass around the edge.