Further study of the cation ordering in phengite 3T by neutron powder diffraction

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doi: 10.1180/002646100549085
Authors:Pavese, A.; Ferraris, G.; Pischedda, V.; Radaelli, P.
Author Affiliations:Primary:
Universita di Milano, Dipartimento di Scienze della Terra, Milan, Italy
Other:
CNR, Italy
Universita di Torino, Italy
Institut Laue-Langevin, France
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 64(1), p.11-18. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:2000
Note:In English. 14 refs.; illus., incl. 2 tables
Summary:A phengite 3T from the Doira-Maira massif, Italian western Alps, with composition K0.96Na0.01Al1.44Mg0.56(Si3.59Al0.41)O10(OH)2, has been investigated using neutron powder diffraction. In the octahedral sheet, Al tends to order into the M2 site, in accordance with measurements made earlier using the time-of-flight technique, whereas the Al/Si tetrahedral ordering (i.e. Si fully into the T1 site) is at variance with previous results. These discrepancies are attributed to the presence of talc impurities (∼ 6%) in the previous sample. [R.A.H.]
Sections:Crystal structure
Subsections:Specific structures: silicates
Subjects:Cations; Crystal structure; Mica group; Phengite; Powder method; Rietveld refinement; Sheet silicates; Silicates; Alps; Cottian Alps; Dora Maira Massif; Europe; Italy; Piedmont Alps; Piemonte Italy; Southern Europe; Western Alps; Western Europe
Abstract Numbers:00M/1279
Record ID:2000041775
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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