Characterization of Al-Si ordering state in an alkali feldspar using atom location by channeling-enhanced microanalysis (ALCHEMI)

Jun Wu, David R. Veblen

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Atom location by channeling-enhanced microanalysis (ALCHEMI) was used to determine the occupancy of Al atoms in the T1o site (t1o) of alkali feldspar. Building on the method demonstrated by previous research, analytical electron microscopy proves to be a viable technique for fully characterizing the Al-Si ordering state in the feldspar framework. We applied this method to orthoclase from Itrongay, Madagascar, and to its heated counterpart. Our preliminary results give 0.74 and 0.37 as 2t1 (=t1o + t1m) and t1o, respectively, for the original orthoclase, vs. 0.54 and 0.28 for heated orthoclase. Single-crystal X-ray diffraction experiments have been performed, and the results agree with our ALCHEMI measurements. This new method promises to help resolve some complex issues relating ordering paths, for example, twinning in feldspars and domain intergrowth in plagioclase.

Original languageEnglish (US)
Pages (from-to)41-46
Number of pages6
JournalAmerican Mineralogist
Volume95
Issue number1
DOIs
StatePublished - Jan 1 2010
Externally publishedYes

Keywords

  • ALCHEMI
  • Al-Si ordering
  • Alkali feldspar
  • Channeling effect

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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