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crystal data
Complete solid solution is observed amongst the compounds of the type M1MgCr2(VO4)3 (where M1 = K, Rb or Tl). The solid-solution series obtained show linear changes in peak positions and peak intensities in their X-ray diffraction patterns. The crystallographic behaviour with respect to the value of x for (RbxK1-xMgCr2(VO4)3 and (TlxK1-x)MgCr2(VO4)3 solid solutions is discussed.