A theory formulated by Hardcastle and Hanus in 1926 predicted that the shape of these objects results from ablation. That theory was adopted by Chapman in an attempt to answer their namesake problem. They can appear as flanged buttons or in a layered form known as Muong-Nong, but the splash-form type studied by Reinhart is most common. Coined in name by Austrian geologist Eduard Suess, a single specimen was discovered on 
A theory formulated by Hardcastle and Hanus in 1926 predicted that the shape of these objects results from ablation. That theory was adopted by Chapman in an attempt to answer their namesake problem. They can appear as flanged buttons or in a layered form known as Muong-Nong, but the splash-form type studied by Reinhart is most common. Coined in name by Austrian geologist Eduard Suess, a single specimen was discovered on Martha's Vineyard with a translucent green color, similar to the moldavites discovered in Czechoslovakia. Once explained by Virgil Barnes as a type of fulgurite, they are characterized by much lower water content than standard obsidians. Theorized to be ejecta from terrestrial impact craters, for 10 points, name these glassy rocks found in large strewn fields in Australasia which may result from meteorite events.
A theory formulated by Hardcastle and Hanus in 1926 predicted that the shape of these objects results from ablation.
tektites