Crystal chemistry of synthetic pyroxenes on the join CaNiSi2O6-CaMgSi2O6 (diopside): a Rietveld structure refinement study

A series of monoclinic C2/c pyroxenes was synthesized along the join CaNiSi 2 O 6 -CaMgSi 2 O 6 (diopside). The crystal structures of these pyroxenes were refined indices were in the range 2.7-3.7%. Cell parameters and mean bond lengths vary linearly as a function of composition along the join. However, the derived trends differ significantly from those of the CaM 2+ Si 2 O 6 (M 2+ =Mg, Co, Fe, Mn) C2/c pyroxenes

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