Site preference and local geometry of Sc in garnets: II. The crystal-chemistry of octahedral Sc in the andradite- Ca3Sc2Si3O12 join. (Articolo in rivista)

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  • Site preference and local geometry of Sc in garnets: II. The crystal-chemistry of octahedral Sc in the andradite- Ca3Sc2Si3O12 join. (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Quartieri S.; Oberti R.; Boiocchi M.; Dalconi M.C.; Boscherini F.; Safonova O.; Woodland A.B. (2006)
    Site preference and local geometry of Sc in garnets: II. The crystal-chemistry of octahedral Sc in the andradite- Ca3Sc2Si3O12 join.
    in The American mineralogist
    (literal)
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  • Quartieri S.; Oberti R.; Boiocchi M.; Dalconi M.C.; Boscherini F.; Safonova O.; Woodland A.B. (literal)
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  • 1240 (literal)
Pagina fine
  • 1248 (literal)
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  • 91 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
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  • SIMONA QUARTIERI,1,* ROBERTA OBERTI,2 MASSIMO BOIOCCHI,3 MARIA CHIARA DALCONI,1,. FEDERICO BOSCHERINI,4 OLGA SAFONOVA,5 AND ALAN B. WOODLAND6 1Dipartimento di Scienze della Terra, Università di Messina, Salita Sperone 31, I-98166 Messina S. Agata, Italy 2CNR, Istituto di Geoscienze e Georisorse, Unità di Pavia, via Ferrata 1, I-27100 Pavia, Italy 3Centro Grandi Strumenti, Università di Pavia, via Bassi 21, I-27100 Pavia, Italy 4Dipartimento di Fisica and CNISM, Università di Bologna, Viale Berti Pichat 6/2, I-40127 Bologna, Italy 5European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France 6Institut für Mineralogie, Universität Frankfurt, Senckenberganlage 30, D-60054 Frankfurt, Germany (literal)
Titolo
  • Site preference and local geometry of Sc in garnets: II. The crystal-chemistry of octahedral Sc in the andradite- Ca3Sc2Si3O12 join. (literal)
Abstract
  • Investigation of scandium incorporation in garnets along the synthetic Ca3Fe2 3+Si3O12.Ca3Sc2Si3O12 (adr.CaSc) join, based on the same multi-technique approach used in the companion paper (Oberti et al. 2006a), shows that (1) Sc is incorporated exclusively at the Y octahedron; (2) the local coordination of Sc is slightly different in Sc-poor than in Sc-rich compositions (Sc-O = 2.06 Å in CaSc10 vs. 2.10 Å in CaSc30.90); (3) the local coordination of Ca is also slightly different in Sc-poor than in Sc-rich compositions [Ca1,2-O are 2.34(2) and 2.48(2) Å in CaSc10 and 2.36(2) and 2.50(2) Å in CaSc90, with . Þ xed at 0.14 Å in all the samples]; (4) the linear increase of the unit-cell edge along the join derives from multiple changes in the geometry of the different polyhedra and from the rotation of the tetrahedron around the.4 axis (a rotation), and cannot be modeled from extrapolation of the behavior observed along the Ca3Al2Si3O12.Ca3Fe2 3+Si3O12 (grs.adr) join. CaSc-rich garnets, where a large X dodecahedron coexists with a large Y octahedron and a Z tetrahedron occupied by Si, similar to pyrope-grossular garnets, have the highest a values observed to date in calcium silicate garnets. Slightly lower a values are observed in pyrope and almandine, but correspond to a different structural arrangement, where a small X dodecahedron coexists with a small Y octahedron. These results further conÞ rm the efÞ ciency of a combined short- and long-range approach for understanding the properties of garnet solid solutions. (literal)
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