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- W2160791003 abstract "Letter| August 01, 2011 Differences in Fe-redox for asbestiform and nonasbestiform amphiboles from the former vermiculite mine, near Libby, Montana, U.S.A.† Mickey E. Gunter; Mickey E. Gunter * 1Department of Geological Sciences, University of Idaho, Moscow, Idaho 83844, U.S.A.2Marsh Professor-at-Large, University of Vermont, Burlington, Vermont 05405, U.S.A. *E-mail: mgunter@uidaho.edu Search for other works by this author on: GSW Google Scholar M. Darby Dyar; M. Darby Dyar 3Department of Astronomy, Mount Holyoke College, 50 College Street, South Hadley, Massachusetts 01075, U.S.A. Search for other works by this author on: GSW Google Scholar Antonio Lanzirotti; Antonio Lanzirotti 4Center for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis Avenue, Chicago, Illinois 60637, U.S.A. Search for other works by this author on: GSW Google Scholar Jonathan M. Tucker; Jonathan M. Tucker 3Department of Astronomy, Mount Holyoke College, 50 College Street, South Hadley, Massachusetts 01075, U.S.A. Search for other works by this author on: GSW Google Scholar Elly A. Speicher Elly A. Speicher 3Department of Astronomy, Mount Holyoke College, 50 College Street, South Hadley, Massachusetts 01075, U.S.A. Search for other works by this author on: GSW Google Scholar American Mineralogist (2011) 96 (8-9): 1414–1417. https://doi.org/10.2138/am.2011.3800 Article history received: 04 Feb 2011 accepted: 14 Apr 2011 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Mickey E. Gunter, M. Darby Dyar, Antonio Lanzirotti, Jonathan M. Tucker, Elly A. Speicher; Differences in Fe-redox for asbestiform and nonasbestiform amphiboles from the former vermiculite mine, near Libby, Montana, U.S.A.. American Mineralogist 2011;; 96 (8-9): 1414–1417. doi: https://doi.org/10.2138/am.2011.3800 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract We obtained oriented Fe-XANES spectra on three amphibole bundles of fiber (i.e., asbestiform morphology), two single-crystal fragments (i.e., nonasbestiform morphology), and one aggregate of thousands of smaller particles (termed herein a “puffball”) by use of a spindle stage mounted on beamline X26A, National Synchrotron Light Source, Brookhaven National Lab. These particles of differing morphology were obtained from a single rock sample collected at the former vermiculite mine near Libby, Montana, U.S.A. The XANES spectra vary as a function of orientation for the single-crystal fragments and bundles of fibers and were the same regardless of orientation for the puffball. Differences in the spectra for the single-crystal fragments and bundles of fibers indicate variations in Fe oxidation states between the two differing morphologies. Comparison to a calibration line based on amphibole standards allowed determination of Fe3+/∑Fe values of 0.69 for the bundles of fibers and 0.60 for the single-crystal fragments, while the puffball had a Fe3+/∑Fe value of 0.66. These values agree well with our earlier Mössbauer data on a bulk sample of this same material, with Fe3+/∑Fe of 0.65. To our knowledge, these are the first data that show compositional differences between asbestiform and nonasbestiform amphiboles from the same sample. Because health effects appear to vary with amphibole morphology, these results suggest that iron oxidation, mineral morphology, and potential health effects may all be interrelated. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2160791003 date "2011-08-01" @default.
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- W2160791003 title "Differences in Fe-redox for asbestiform and nonasbestiform amphiboles from the former vermiculite mine, near Libby, Montana, U.S.A." @default.
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