Tektites can be found in only four strewnfields – these areas are known sites of impact craters. The Philippines is part of the youngest but also the largest strewnfield in South East Asia called the Australian strewnfield. Tektites from this area are called Rizalites and are black to dark brown in color.
This fabulous example is known as “breadcrust spheroid” tektites. Their surface is often smoother in appearance but they have deep complex grooving and winding channeling. This takes place in the final stages of the process as the concentric shells split from the cores, possibly due to expansion of the outer layers, as they plunge through the atmosphere.