A detailed comparison is made of the data provided by two independent techniques - a new X-ray structure refinement (XRD) and electron microprobe analysis (EMP) - when applied to the crystal chemistry of a series of cogenetic natural pyroxenes compositionally close to the Di-Jd join. Seven major elements were analysed on seven crystals: the average absolute values of the differences between the two sets of data range 0.003-0.022 with a global mean of 0.014. EMP produces higher Fe(tot) and Mg, and lower Ca and Na. Small corrections, based on well-founded assumptions, reduce the average differences to 0.003-0.011 (global mean 0.008). This work shows that XRD can, in suitable circumstances, provide chemical analyses as accurate as those obtained by EMP.-R.E.S.
|Number of pages||12|
|Journal||Periodico di Mineralogia|
|State||Published - 1983|