Publicado: Sol, Marcha 11, 2018
Ciencia | Por Aurelio Ontiveros

Rare and unseen the mineral was found inside of the diamond

Rare and unseen the mineral was found inside of the diamond

An example of a super-deep diamond from the Cullinan Mine, where scientists recently discovered a diamond that provides first evidence in nature of Earth's fourth most abundant mineral-calcium silicate perovskite-indicating. However visual identification in a diamond is tough because it bends light - which is what makes them so handsome - so it's hard for scientists to rely on what they are seeing because it is extremely distorted, he said. It does represent, however, the first and only time we've seen such an arrangement in ice on Earth. Its lead author was Fabrizio Nestola from the University of Padova, Italy. Increase the pressure once again and the atoms will rearrange themselves into ice-III, then IV, V, VI and VII. Ice-I is the form of ice we're all familiar with, but as pressure increases, it will turn into ice-II which has a "rhombohedral structure".

An global team of researchers have discovered high-pressure ice crystals embedded inside diamonds, technology, science and science fiction website Gizmodo reported.

Unlike the other phases of ice, however, ice-VII remains fairly stable even as the pressure increases.

Rossman said that finding ice-VII, even by accident, was a thrill for the whole team. Diamonds in general provide access to the deepest intact material from the Earth's interior with the help of the minerals that contained within their volumes. But for obvious reasons, it has proven impossible to find a naturally occurring sample of ice VII at the surface. As you'll recall, the mantle is too warm for ice-VII to exist.

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The rocks can shed light on the deepest parts of Earth's core. As part of their formation process they will occasionally encapsulate teeny bits of the chemical environment around them in what are called inclusions. The diamond originated roughly 700 kilometres below Earth's surface, whereas most diamonds are formed at 150 to 200 kilometres depth. This mineral is one of those that makes the Earth's mantle. But since nobody has been able to keep the mineral stable at accessible depths, it has proven very hard to study. But for Tschauner and other scientists, those impurities, known as inclusions have infinite value, as they may hold the key to understanding the inner workings of our planet. "But if a diamond comes up fast enough, it doesn't change".

An earlier study, from December 2016, looked at fragments of some of the world's largest precious stones (the flakes are produced when rough stones are cut and polished) and based on the minerals trapped in them, concluded that they formed at depths corresponding to the deep mantle. Then, as they rise towards the surface, the cooling temperatures allows ice-VII to form.

Thanks to their discovery, ice-VII has been recognised for the first time as a mineral by the International Mineralogical Association.

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