American Mineralogist, Volume 88, pages 1970–1978, 2003 3+ Composition, Fe /SFe, and crystal structure of non-asbestiform and asbestiform amphiboles from Libby, Montana, U.S.A. 1, 2 3 4 MICKEY E. GUNTER, * M. DARBY DYAR, BRENDAN TWAMLEY, FRANKLIN F. FOIT JR., AND SCOTT CORNELIUS Department of Geological Sciences, University of Idaho, Moscow, Idaho 83844-3022, U.S.A. Department of Earth and Environment, Mount Holyoke College, South Hadley, Massachusetts 01075, U.S.A. University Research Office, University of Idaho, Moscow, Idaho 83844-3010, U.S.A. Department of Geology, Washington State University, Pullman, Washington 99164-2812, U.S.A. ABSTRACT 3+ Compositional data and Fe /SFe ratios obtained by electron microprobe and Mössbauer analyses are given for a suite of three amphibole and amphibole-asbestos samples collected from the former 3+ vermiculite mine near Libby, Montana. A crystal structure analysis, compositional data, and Fe /SFe values for two samples from a previous study are also reported. The results confirm the conclusion drawn in the previous study that these amphiboles are dominantly compositions ranging from winchite 3+ to richterite. Mössbauer spectroscopy yielded Fe /SFe ratios from 58% to 72% for the five samples. The crystal structure was determined for a single crystal selected from a bulk sample. Its formula (as determined by electron
American Mineralogist – de Gruyter
Published: Nov 1, 2003
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