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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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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... Tektite Shapes Take a large piece of rock moving very fast and slam it into the Earth and you can make a crater, release tremendous energy, and kill everything for miles around. But, you probably will not make tektites. These pecular pieces o... Moon and Mars Meteorites It seems that when the discussion of Martian and Lunar meteorites comes up two questions are always asked. First how do they get to Earth? And secondly, how do you know they are from the Moon or Mars? Most met... |
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