Text icon  Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal

 
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Description: This is a scientific article, which introduces Icosahedrite, ideally Al63Cu24Fe13, a new mineral from the Khatyrka River, southeastern Chukhotka, Russia. Icosahedrite is opaque with a metallic luster, possesses a gray streak, and is brittle with an uneven fracture. For quasicrystals, by definition, the structure is not reducible to a single three-dimensional unit cell, so neither cell parameters nor Z can be given. The X-ray powder pattern was indexed on the basis of six integer indices, as conventionally used with quasicrystals, where the lattice parameter (in six-dimensional notation) is measured to be a6D = 12.64 Å, with probable space group Fm35. The new mineral is named for the icosahedral symmetry of its internal atomic structure, as observed in its diffraction pattern. Both the new mineral and mineral name have been approved by the Commission on New Minerals, Nomenclature and Classification, IMA (2010-042). The article is published in American Mineralogist, Volume 96, pages 928–931, 2011. DOI: 10.2138/am.2011.3758
Keywords: icosahedrite • mineral • natural quasicrystal • electron-microprobe • reflectance • X-ray diffraction • Al-Cu-Fe • atomic structure • Kamchatka
Categories: Science approaches > Structure, bonding & defects > Atomic structure
Materials > Ceramics & glasses > Minerals & stone
Testing, analysis & experimentation > Diffraction
Testing, analysis & experimentation > Spectroscopy
Created by: Paul J. Steinhardt, Princeton Center for Theoretical Science, Princeton University, Princeton
Luca Bindi, NR-Istituto di Geoscienze e Georisorse, Sezione di Firenze, Firenze
Nan Yao, Princeton Institute for the Science and Technology of Materials, Princeton University
Peter J. Lu, Department of Physics and SEAS, Harvard University, Cambridge, Massachusetts
Published by: Mineralogical Society of America
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Date created: 08 December 2010
Date added: 10 October 2011
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Resource ID: 3734