Dear Friends, I have two questions on PXRD. First, is it possible to distinguish between illite and glauconite and celadonite in a complex mixture containing quartz, illite, muscovite, chlorite and kaolinite (plus some interstratified clay minerals)? I was trying with (060) reflections, and I cannot observe anything with d(060) > 1.51, but there is a reflection between 1.50 (that I ascribe to illite) and 1.51, thus I assumed it could be from celadonite. Second question. I use TOPAS (v. 4.0) for the Rietveld refinement. I have samples with dolomite and I know that it is strongly zoned, thus the main reflection is split (dolomite + ankerite). As an input I've used these 2 structures, but both reflections obtained during the refinement lie at the same position, leaving the "shoulder" non-adjusted (to dolomite). I suppose this result is wrong (?). Do you have any idea how to fit such a "shoulder-like" reflection in such case?
Best regards! -- Łukasz Kruszewski, Ph.D., adjunct Polish Academy of Sciences Institute of Geological Sciences X-Ray Diffraction Laboratory (coordinator) Twarda 51/55 str. 00-818 Warsaw Poland
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