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Seven clinopyroxene compositions along the join  M2 Li M1 Al T Si 2 O 6  (spodumene) to  M2 Li M1 Fe 3+T Si 2 O 6  (ferri-spodumene) were synthesized at 2 GPa, 800 °C under highly oxidizing conditions (using H 2 O 2  fluid) in an end-loaded piston cylinder. In addition, the LiFe 3+ Si 2 O 6  composition was also synthesized under the intrinsically reducing conditions in a piston cylinder, to check the effect of  f  O 2   on iron speciation. The run products were characterized by field emission scanning electron microscope (FE-SEM), Rietveld refinements on XRPD synchrotron data, and space groups were assigned using SAED-TEM patterns. Run products are composed mainly of lithium clinopyroxene (Li-Cpx), plus minor amounts of hematite (magnetite under reducing condition) and corundum, as independently detected by image analysis (area%) and Rietveld refinements (wt%); moreover, Rietveld results were used to derive cell parameters, M1-site occupancy (Al vs. Fe 3+ ), atomic positions, and average bond lengths of all these Li-Cpx indexed in the  C 2/ c  space groups according to SAED-TEM.

american mineralogist

Solid solution along the synthetic LiAISi 2 O 6 -LiFeSi 2 O 6  (spodumene-ferri-spodumene) join: A general picture of solid solutions, bond lengths, lattice strains, steric effects, symmetries, and chemical compositions of Li clinopyroxenes