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Nature 451, 269-270 (17 January 2008) | doi:10.1038/nature06584; Published online 16 January 2008

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Mineralogy at the extremes

Thomas S. Duffy1

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The discovery of a new silicate structure at conditions corresponding to a depth of 2,700 kilometres below Earth's surface has fundamentally changed our understanding of the boundary between the core and mantle.

Connections between scientific disciplines can emerge in unexpected ways. In 2004, mineralogists rushed to their libraries to locate a somewhat obscure 40-year-old paper1 that described an unusual crystal structure found in a compound of calcium iridium oxide (CaIrO3).

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