Museum grade disc Tektites from the world largest Tektite strewn field. Impressive dimension, with schlieren ; a small chip on one side, big chip at back side Found in Guangdong province / China . with typical pits and schlieren. Tektites are natural glass, generated by a huge meteorite impact. By hitting the ground the kinetic energy from the meteorite was set free in a huge explosion, that vaporised the meteorite and the surrounding earth surface. Jets of rock steam were ejected from the new born crater. The steam jets cooled down in the higher atmosphere and condensed to glass that rained down up to hundreds of kilometres away from the impact. 409g 85 x 82 x 47 mm scale-cube is 1 x 1 x 1 cm International meteorite collector association member number #3503