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Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal. (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal. (Articolo in rivista) (literal)

Anno

2011-01-01T00:00:00+01:00 (literal)

Alternative label

Bindi, L (1)(2); Steinhardt, P.J (3)(4); Yao, N (5); Lu, P.J (6) (2011)
Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal.
in The American mineralogist; Mineralogical Society of America, Washington (Italia)
(literal)

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Bindi, L (1)(2); Steinhardt, P.J (3)(4); Yao, N (5); Lu, P.J (6) (literal)

Pagina inizio

928 (literal)

Pagina fine

931 (literal)

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ID_PUMA: /cnr.igg/2011-A0-043.Area di valutazione 04 - Scienze della Terra (literal)

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http://www.minsocam.org/msa/ammin/ammineral.html (literal)

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96 (literal)

Rivista

?The ?American mineralogist (Rivista)

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0506 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

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(1) Museo di Storia Naturale, Sezione di Mineralogia, Università di Firenze, Firenze, Italy; (2) CNR-Istituto di Geoscienze e Georisorse, Sezione di Firenze, Firenze, Italy; (3) Princeton Center for Theoretical Science, Princeton University, Princeton, United States; (4) Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, United States; (5) Princeton Institute for the Science and Technology of Materials, Princeton University, United States; (6) Department of Physics and SEAS, Harvard University, Cambridge, United States. (literal)

Titolo

Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal. (literal)

Abstract

Icosahedrite, ideally Al63Cu24Fe13, is a new mineral from the Khatyrka River, southeastern Chukhotka,Russia. It occurs as dark gray-black anhedral to subhedral grains up to 100 ?m across, closely associated with spinel, diopside, forsterite, nepheline, sodalite, corundum, stishovite, khatyrkite, cupalite, and an unnamed phase of composition AlCuFe. Icosahedrite is opaque with a metallic luster, possesses a gray streak, and is brittle with an uneven fracture. The density could not be determined. 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. In plane-polarized incident light, icosahedrite exhibits neither bireflectance nor pleochroism. Between crossed polars, it is isotropic. Reflectance percentages (Rmin = Rmax) for the four standard COM wavelengths are 62.3 (471.1 nm), 60.6 (548.3 nm), 58.1 (586.6 nm), and 56.0 (652.3 nm), respectively. 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 Fm3 5. The four strongest X-ray powder-diffraction lines [d in Å (I/I0) (n1,n2,n3,n4,n5,n6)] are: 2.006 (100) (420 042), 2.108 (90) (422 222), 1.238 (30) (604 064), and 3.41 (25) (311 111). Average results of 34 electron-microprobe analyses gave, on the basis of total atoms = 100, the formula Al63.11Cu24.02Fe12.78Si0.03Co0.01Ca0.01Zn0.01Cr0.02Cl0.01. The simplified formula is Al63Cu24Fe13, which requires the mass fractions Al 43.02, Cu 38.60, Fe 18.38, total 100.00 wt%. 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). (literal)

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