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Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined X-ray diffraction and FTIR spectroscopic approach

Published online by Cambridge University Press:  05 July 2018

G. Della Ventura ,
F. Bellatreccia ,
F. Cámara  and
R. Oberti
G. Della Ventura*
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy INFN, Laboratori Nazionali di Frascati, Via E. Fermi, 40, 00044 Frascati, Rome, Italy
F. Bellatreccia
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy INFN, Laboratori Nazionali di Frascati, Via E. Fermi, 40, 00044 Frascati, Rome, Italy
F. Cámara
Affiliation:
Dipartimento di Scienze della Terra, via Valperga Caluso 35, I-10125 Turin, Italy CrisDi, Interdepartmental Centre for Crystallography, Via P. Giuria 5, 10125, Turin, Italy
R. Oberti
Affiliation:
CNR-Istituto di Geoscienze e Georisorse, UOS Pavia, via Ferrata 1, I-27100 Pavia, Italy
*
E-mail: [email protected]
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Abstract

This study addresses the crystal chemistry of a set of five samples of F-rich amphiboles from the Franklin marble (USA), using a combination of microchemical (Electron microprobe analysis (EMPA)), single-crystal refinement (SREF) and Fourier transform infrared (FTIR) spectroscopy methods. The EMPA data show that three samples fall into the compositional field of fluoro-edenite (Hawthorne et al., 2012), whereas two samples are enriched in high-charged C cations and – although very close to the CR3+ boundary – must be classified as fluoro-pargasite. Magnesium is by far the dominant C cation, Ca is the dominant B cation (with BNa in the range 0.00−0.05 a.p.f.u., atoms per formula unit) and Na is the dominant A cation, with A☐ (vacancy) in the range 0.07−0.21 a.p.f.u.; WF is in the range 1.18−1.46 a.p.f.u. SREF data show that: TAl is completely ordered at the T(1) site; the M(1) site is occupied only by divalent cations (Mg and Fe2+); CAl is disordered between the M(2) and M(3) sites; ANa is ordered at the A(m) site, as expected in F-rich compositions. The FTIR spectra show a triplet of intense and sharp components at ~3690, 3675 and 3660 cm−1, which are assigned to the amphibole and the systematic presence of two very broad absorptions at 3560 and 3430 cm−1. These latter are assigned, on the basis of polarized measurements and FPA (focal plane array) imaging, to chlorite-type inclusions within the amphibole matrix. Up to eight components can be fitted to the spectra; band assignment based on previous literature on similar compositions shows that CAl is disordered over the M(2) and M(3) sites, thus supporting the SREF conclusions based on the <M−O> bond distance analysis. The measured frequencies of all components are typical of O−H groups pointing towards Si−O(7)−Al tetrahedral linkages, thus allowing characterization of the SRO (shortrange- order) of TAl in the double chain. Accordingly, the spectra show that in the fluoro-edenite/ pargasite structure, the T cations, Si and Al, are ordered in such a way that Si−O(7)−Si linkages regularly alternate with Si−O(7)−Al linkages along the double chain.

Keywords

fluoro-edenitefluoro-pargasiteEMPAsingle-crystal structure refinementFTIR powder and single-crystal spectraFPA imagingshort-range order
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 2 , April 2014 , pp. 293 - 310
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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Table 5. Atomic coordinates and displacement factors

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