Tektites are small, irregularly shaped glassy nodules that have no crystal structure and are similar to obsidian. Tektites are thought to be from meteorites, but their origin is not proven, some scientists maintaining that they are terrestrial and produced as a result of meteorite impacts, others believing them to be meteorite material. Research Tektite
 
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert