Composition and temperature dependence of Fe-Mg ordering in cummingtonite-grunerite as determined by X-ray diffraction

M. Hirschmann, B. W. Evans, Yang Hexiong Yang

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49 Scopus citations

Abstract

The crystal structures of 24 heat-treated and six unheated natural ferromagnesian clinoamphiboles have been refined from single-crystal X-ray intensity data. With the assumption that Ca is restricted to the M4 site and that Mn is strongly ordered into the M4 site, M123 vs. M4 site preferences determined by Mossbauer spectroscopy are consistent with our X-ray diffraction results. The projection of the Mossbauer data of natural cummingtonite and grunerite collected by Hafner and Ghose (1971) indicates stronger ordering between M4 and M123 than previously interpreted. -from Authors

Original languageEnglish (US)
Pages (from-to)862-877
Number of pages16
JournalAmerican Mineralogist
Volume79
Issue number9-10
StatePublished - Jan 1 1994

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