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wikipedia) Breaking News: Researchers discover 'ghostly' signs of a mysterious new mineral - News Paper
An international research team including Curtin University scientists has documented the 'ghost' of an undiscovered mineral at two ancient meteorite impact craters.
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Monazite under a microscope showing the former presence of a new mineral
[Credit: Curtin University] |
The new study, published in the
journal Geology, is the first to document evidence of a new form of the mineral monazite, which only exists on Earth during the immense pressures exerted by meteorite impacts.
Study co-author Associate Professor Nick Timms, from Curtin's Space Science and Technology Centre, said the international research team made their discovery by looking at tiny rock fragments from impact craters in Germany and Canada using a high-powered electron microscope.
"We found microscopic evidence that monazite, a rare earth element phosphate, transformed to another crystal structure under high pressure from a shockwave, similar to how graphite can turn into diamond under pressure," Professor Timms said.
"However, the mineral reverted to its original crystal structure instead of maintaining this new structural form, and while the new mineral only existed for fractions of a second as the shockwave passed through the Earth close to ground zero, it left unique crystallographic clues to its existence.
"We are on the verge of discovering a new mineral, but there is a hitch because the mineral is not stable at the Earth's surface and readily transforms back to monazite again. Therefore, we have really only seen, and will probably only ever see, its 'ghost'."
The evidence for the new mineral was found at two ancient meteorite impact craters – the Ries Crater in Germany and the Haughton impact structure in arctic Canada – but until the elusive mineral is found preserved in rocks, scientists cannot give it a proper name.
Source: Curtin University [April 17, 2019]
from The Archaeology News Network http://bit.ly/2GwVxS7
Breaking News: Researchers discover 'ghostly' signs of a mysterious new mineral - News Paper
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