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University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
An experimental method for the determination of Ab-Or exsolution and Al-Si ordering in alkali feldspar is described. Powder infrared spectroscopy was used to measure spectra in the spectral range between 50 and 1500 cm (super -1) using about 5 mg of sample material. The spectra were analyzed using reference spectra of uniform samples with various Ab-Or compositions and several degrees of Al-Si order. The application of this method is demonstrated for two examples of exsolved feldspar minerals, and it is shown that detailed characterization of alkali feldspars using IR spectroscopy leads to new insight into their structural details.
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  M. Tribaudino, M. Zhang, and E. K. H. Salje Cation ordering and phase transitions in feldspars along the join CaAl2Si2O8-SrAl2Si2O8: a TEM, IR and XRD investigation Mineralogical Magazine, June 15, 2009; 73(1): 119 - 130. [Abstract] [Full Text] [PDF]
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