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The dependence of the Si-O distances on the electronegativitq, the electronic structure and the size of the non-tetrahedral cations has been re-examined for NaM3+Si2O6 pyroxenes. In the Sc-V-Al series the difference, Δbr-Δmean, decreases with increasing the electronegativity and the diffeaence, Δnbr-Δmean, increases with increasing the electronegativity, where the dmean is the difference between the mean of the four Si-O distances inNaAISi2O6 pyroxene and teat in NaM3+Si2O6 pyroxene, and Δbr-Δmean is the difference between the mean of the Si-O (br) distances and the Δmean. In the Cr-ln-Fe series themean of the Si-O (nbr) distances increases with increasing the electronegativity and thedifference, Δbr-2Δmean, decreases with increasing the electronegativity.

Studies on the Si-O distances in NaM3+Si2O6 pyroxenes.