Comparison of chemical analysis of sodic pyroxenes by X-ray structure refinement and electron microprobe techniques.

G. Rossi, D. C. Smith, L. Ungaretti, C. Domeneghetti

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Abstract

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.

Original languageEnglish
Pages (from-to)343-354
Number of pages12
JournalPeriodico di Mineralogia
Volume52
Issue number3
StatePublished - 1983
Externally publishedYes

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