Citation: Lopano, C. L.; Heaney, P. J.; Post, J. E.; Hanson, J.; Komarneni, S. (2007). Time-resolved structural analysis of K-and Ba-exchange reactions with synthetic Na-birnessite using synchrotron X-ray diffraction Locality: synthetic Sample: Ba-birnessite. American Mineralogist, 92, pp. 380-387.