I've been looking at EDS data for monazite-(Ce): EDS Data1

EDS Data2

EDS Data3

And I noticed that (at the O=4 column) the ratios of substitutable elements are not integers. I thought that it was because of measurement errors, but the second and third data has values of 0.8656 and 0.7892 which doesn't seem like errors at all. Is there a reason why they have non-integer ratios?

My guess is that: because the samples were taken from a small portion of the rock itself, some unit cells of monazite were partially separated resulting in a non-integer ratio. Am I correct? Please add references for answers.



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