The (Mg,Fe2+) substitution in ferri-clinoholmquistite, Li2(Mg,Fe2+)3Fe3+2Si8O22(OH)2

Iezzi, Gianluca; Ventura, Giancarlo Della; Hawthorne, Frank C.; Pedrazzi, Giuseppe; Robert, Jean-Louis; Novembre, Daniela

doi:10.1127/0935-1221/2005/0017-0733

Cited by 19 publications

(19 citation statements)

References 20 publications

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“…The spectrum is consistent with the distribution of Mg and Fe 2+ at the C-sites, the observed bands being assigned to hydroxyl groups bonded to MgMgMg, MgMgFe 2+ , MgFe 2+ Fe 2+ , and Fe 2+ Fe 2+ Fe 2+ octahedral clusters, from higher to lower frequency, respectively. Moreover, no bands due to the presence of Fe 3+ are observed in this spectrum [57,58], demonstrating it to be fully ordered at the M (2)-site. The peaks of UICC amosite are sharp, with a nearly Lorentzian shape and without any hyperfine splitting such as that observed for anthophyllite (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

et al. 2018

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Vibrational spectroscopies (Fourier Transform Infra Red, FTIR, and Raman) are exceptionally valuable tools for the identification and crystal–chemical study of fibrous minerals, and asbestos amphiboles in particular. Raman spectroscopy has been widely applied in toxicological studies and thus a large corpus of reference data on regulated species is found in the literature. However, FTIR spectroscopy has been mostly used in crystal–chemical studies and very few data are found on asbestos amphiboles. This paper is intended to fill this gap. We report new FTIR data collected on a suite of well-characterized samples of the five regulated amphibole species: anthophyllite, amosite, and crocidolite, provided by the Union for International Cancer Control (UICC) Organization, and tremolite and actinolite, from two well-known occurrences. The data from these reference samples have been augmented by results from additional specimens to clarify some aspects of their spectroscopic features. We show that the FTIR spectra in both the OH-stretching region and in the lattice modes region can be effective for rapid identification of the asbestos type.

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Section: Resultsmentioning

confidence: 99%

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

et al. 2018

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“…Considering that the exact wavenumbers of the OH-stretching bands are also sensitive, albeit weakly, to the nextnearest neighbours, i.e. the M (4) and M (2) cations [8,46,52], the calcic amphiboles tremolite-actinolite can be easily distinguished from the ferromagnesian amphiboles of the anthophyllite-grunerite type. For simple binary M (1,3) Mg-M(1,3) Fe 2+ solid-solutions, as is typically the case for asbestos amphiboles, the relative amount of these cations in the OH-bonded octahedra can be calculated with a high degree of confidence [26], and, provided that the Al and Fetot amounts are known from EMPA, the complete cation distribution at all octahedral sites can be derived.…”

Section: Resultsmentioning

confidence: 99%

“…The spectrum is consistent with the distribution of Mg and Fe 2+ at the C-sites, the observed bands being assigned to hydroxyl groups bonded to MgMgMg, MgMgFe 2+ , MgFe 2+ Fe 2+ and Fe 2+ Fe 2+ Fe 2+ octahedral clusters, from higher to lower frequency, respectively. Moreover, no bands due to the presence of Fe 3+ are observed in this spectrum [52][53], demonstrating it to be fully ordered at the M(2)-site. The peaks of UICC amosite are sharp, with a nearly Lorentzian shape and without any hyperfine splitting such as that observed for anthophyllite (Fig.…”

Section: Uicc Amosite (Grunerite Asbestos)mentioning

confidence: 99%

FTIR Spectroscopy of the Regulated Asbestos Amphiboles

Ventura¹,

Vigliaturo²,

Gieré³

et al. 2018

Preprint

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Vibrational spectroscopies (FTIR, Raman) are exceptionally valuable tools for the identification and crystal-chemical study of fibrous minerals, and asbestos amphiboles in particular. Raman spectroscopy has been widely applied in toxicological studies and thus a large corpus of reference data on regulated species is found in the literature. However, FTIR spectroscopy has been mostly used in crystal-chemical studies and very few data are found on asbestos amphiboles. This paper is intended to fill this gap; we report new FTIR data collected on a suite of well-characterized samples of the five regulated amphibole species: anthophyllite, amosite and crocidolite, provided by the Union for International Cancer Control (UICC) Organization, and tremolite and actinolite, from two well-known occurrences. The data from these reference samples have been augmented by results from additional specimens to clarify some aspects of their spectroscopic features. We show that the FTIR spectra in both the OH-stretching region and in the lattice modes region can be effective for rapid identification of the asbestos type.

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“…it would be expected to be hosted at the M(2)-site as well. Since the M(2)-site is a next nearest neighbouring site to the hydroxyl group its effect on the spectra would be to give a small chemical shift on the order of only some cm -1 (Iezzi et al 2003b(Iezzi et al , 2004a(Iezzi et al , 2005a. Such shifts can be used to identify M-site clustering configurations, since they can results in the presence of 3 or 4 relatively narrow bands due to the substitution of Fe 2?…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…Therefore, FTIR spectroscopy has previously focused primarily on synthetic amphiboles (e.g., Della Ventura et al 1998;Gottschalk et al 1998Gottschalk et al , 1999Raudsepp et al 1987;Robert et al 1989Robert et al , 1993Najorka et al 2000), for which chemical variations can be relatively reduced and crystal chemical complexities can be decoupled. Such studies have allowed us to gain a better understanding of these naturally complex minerals; from these studies we now have information on cation-anion ordering (e.g., Iezzi et al 2003aIezzi et al , b, 2004aIezzi et al , 2005aDella Ventura et al 1999;Hawthorne et al 1997Hawthorne et al , 2000Ishida et al 2002;Gottschalk et al 1998Gottschalk et al , 1999Jenkins et al 2003), symmetry (e.g., Iezzi et al 2004b), and phase-transition characterization at non-ambient conditions (e.g., Iezzi et al 2005b).…”

Section: Introductionmentioning

confidence: 99%

OH in zoned amphiboles of eclogite from the western Tianshan, NW-China

Zhang

Redfern

et al. 2008

Int J Earth Sci (Geol Rundsch)

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Chemically-zoned amphibole porphyroblast grains in an eclogite (sample ws24-7) from the western Tianshan (NW-China) have been analyzed by electron microprobe (EMP), micro Fourier-transform infrared (micro-FTIR) and micro-Raman spectroscopy in the OHstretching region. The EMP data reveal zoned amphibole compositions clustering around two predominant compositions: a glaucophane end-member ( B Na 2 C M 2? 3 M 3? 2 T Si 8 (OH) 2 ) in the cores, whereas the mantle to rim of the samples has an intermediate amphibole composition ( A 0.5 B Ca 1.5 Na 0.5 C M 2? 4.5 M 0.5 3? T Si 7.5 Al 0.5 (OH) 2 ) (A = Na and/or K; M 2? = Mg and Fe 2? ; M 3? = Fe 3? and/or Al) between winchite (and ferro-winchite) and katophorite (and Mg-katophorite). Furthermore, we observed complicated FTIR and Raman spectra with OH-stretching absorption bands varying systematically from core to rim. The FTIR/ Raman spectra of the core amphibole show three lowerfrequency components (at 3,633, 3,649-3,651 and 3,660-3,663 cm -1 ) which can be attributed to a local O(3)-H dipole surrounded by M(1) M(3) Mg 3 , M(1) M(3) Mg 2 Fe 2? and M(1) M(3) Fe 2?3 , respectively, an empty A site and T Si 8 environments. On the other hand, bands at higher frequencies (3,672-3,673, 3,691-3,697 and 3,708 cm -1 ) are observable in the rims of the amphiboles, and they indicate the presence of an occupied A site. The FTIR and Raman data from the OHstretching region allow us to calculate the site occupancy of the A, M(1)-M(3), T sites with confidence when combined with EPM data. By contrast M(2)-and M(4) site occupancies are more difficult to evaluate. We use these samples to highlight on the opportunities and limitations of FTIR OH-stretching spectroscopy applied to natural high pressure amphibole phases. The much more detailed cation site occupancy of the zoned amphibole from the western Tianshan have been obtained by comparing data from microchemical and FTIR and/or Raman in the OH-stretching data. We find the following characteristic substitutions Si (T-site) (Mg, Fe)[M(1)-M(3)-site] ? Al(T-site) Al[M(1)-M(3)-site] (tschermakite), Ca(M4-site)h (A-site) ? Na(M4-site) Na ? K(A-site) (richterite), and Ca(M4-site) (Mg, Fe) [M(1)-M(3)-site] ? Na(M4-site) Al[M(1)-M(3)-site] (glaucophane) from the configurations observed during metamorphism.

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The (Mg,Fe2+) substitution in ferri-clinoholmquistite, Li2(Mg,Fe2+)3Fe3+2Si8O22(OH)2

Cited by 19 publications

References 20 publications

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

FTIR Spectroscopy of the Regulated Asbestos Amphiboles

OH in zoned amphiboles of eclogite from the western Tianshan, NW-China

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