Citation: Bell, A. M. T.; Henderson, C. M. B. (1996). Rietveld Refinement of the Orthorhombic Pbca Structures of Rb~2~CdSi~5~O~12~, Cs~2~MnSi~5~O~12~, Cs~2~CoSi~5~O~12~ , and Cs~2~NiSi~5~O~12~ Leucites by Synchrotron X-ray Powder Diffraction. Acta Crystallographica Section C, 52, pp. 2132-2139.