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Australite Cores - The formation of a flange on an australite seems to be a very stressful process to the glass body as it is fall back to Earth. In most cases the tektite can not make it to the ground with its flange intact. At some point the entire front of the tektite will detach. Several theories have been presented to acount for this detachment of the ablated surface and flange. Among most reasonable is that there is thermal stress between the hot melted surface and the cold glass of the remainder of the body. Cracks form and the aerodynamially shaped portion spalls away. What is left is referred to as a core. It is very easy to distinguish a core visually. It will have the remains of the location of the flange as a bump running around its perimeter, The curved posterior side will look just as it does on the unablated side of a flanged button. However there will be numerous flats around the perimeter of the core where aerodynamically shaped material has broken away in sections. The surface that had ringwaves is of course by definition gone as well. Cores
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SpecialMeteorite Articles
Meteorite TV Show on The Science Channel
Our good friends Geoffrey Notkin and Steve Arnold are starring in another TV Show, this time for The Science Channel. For more information please read the press release below and see their METEORITE MEN website. SCIENCE CHANNEL’S METEORITE MEN TAKES VIEWERS ON QUEST FOR EXTRATERRESTRIAL T... New Meteor Crater Book For Sale Jim has just completed his third and much expanded edition of James Tobin’s history of the first hundred years of investigations at Meteor Crater. Jim has narrative tours of the sites on the crater rim and slopes, as well as a na... Hunting Meteorites in Franconia In late October you may have noticed that we put up a notice on our meteorites-for-sale.com site that we would be out of town for a week. We had not spent more that a day here or there hunting mete... |
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