Data for "Experimental constraints on Mg isotope fractionation during the aragonite-calcite transition and implications for seawater δ26Mg reconstruction"

The mineralogical and geochemical compositions of the carbonate reactants and products, as well as the geochemical compositions of the solution (Tables S1–S3) for "Experimental constraints on Mg isotope fractionation during the aragonite-calcite transition and implications for seawater δ26Mg reconstruction".