Sample names are presented as both ratios and proportions (0.4Li-ISG = Li29Na71-ISG and 0.9Li-ISG = Li47Na53-ISG). Li-ISG - Precursor masses, density and particle Sizes.xlsx: Contains the masses of precursor oxides and carbonates used in the fabrication of the Li-ISG glasses, density measurements of the four pristine glass batches (measured using Archimedes' principle) and particle size distributions measured using light scattering. Li-ISG - EPMA.xlsx: Contains the pristine glass compositions measured through EPMA. Li-ISG - ICP-OES of pristine glass.xlsx: Contains the pristine glass composition measured through acid digestion then ICP-OES. The final compositions are given as a combination of the EPMA and ICP-OES results. Li-ISG - Leaching weighing, calibrations and times.xlsx: Gives the raw masses of glass powders and leachant used at the beginning of each dissolution experiment and the mass loss at the end of each experiment alongside the times recorded for each experiment and the individual glass surface area to leachant volume ratios (SA/V) calculated for each leaching vessel. Calibrations and calibration times for pH meters and pipettes are also given. The pH of the leachates at the end of each experiment are also reported. Li-ISG - ICP-MS.xlsx: Blank and leachate concentrations from the dissolution experiments. Li-ISG - XRD.xlsx: XRD analysis of the Li-ISG powders (pristine and leached). Li-ISG - 11B NMR spectra, fits and quantification.zip: Contains the 11B MAS-NMR spectra (.ASC) of the leached and pristine Li-ISG glasses, as well as the fit files for fitting the spectra in DMFIT software. Li-ISG and Li-Mg-EM - 6Li-1H CP-NMR spectra.zip: Contains the .ASC spectra files for the 6Li-1H spectra. Li-ISG and Li-Mg-EM - 23Na NMR spectra, fits and quantification.zip: Contains the .ASC spectra files for the 23NA NMR spectra as well as the Igor Pro quantification files and results. SEM sample key.xlsx: Gives the sample numbers and names for the two SEM .zip folders. Li-ISG - SEM - 20180104.zip and Li-ISG - SEM - 20180115.zip: Contain the SEM images in a .tif format.