6Li-Mg-EM - Alkali fusion and HF digest Li MC-ICP-MS.xlsx: Sheets on the concentration runs of the Li fractions from column chemistry prior to 7Li/6Li MC-ICP-MS analysis, the raw data from the 7Li/6Li MC-ICP-MS analyses, and the results for the 6Li-Mg-EM alkali fusions and HF digest. 6Li-Mg-EM - Alkali fusions masses and ICP-OES and HF digest masses.xlsx: Sheets on the masses of washed and sized 6Li-Mg-EM and K2CO3 used in the alkali fusions, mass of washed and sized 6Li-Mg-EM used in the HF digest, calibration standard concentrations for ICP-OES analysis of the 6Li-Mg-EM fusion supernatants and residues, raw intensities and concentrations from ICP-OES analysis of the fusion supernatants and residues, calculated percent recoveries and volumes of fusion supernatant to be diluted prior to loading onto the AG MP-50 columns. 6Li-Mg-EM - Dissolution experiment masses, times, pH, SA-V ratios and DF.xlsx: Masses of leachant and 6Li-Mg-EM powder used in the dissolution experiments, times at which the experiments were started and aliquots were taken, pipette and pH meter calibrations, leachant pH and leachate pH (28, 70 and 98 d as appropriate), glass surface area to leachant volume ratios throughout the experiments, and dilution factors for the diluted aliquots. 6Li-Mg-EM - Glass making, preparation, density, XRD and laser diffraction.xlsx: Calculations on the masses of precusor powders required in making 6Li-Mg-EM and the actual masses weighed, records of preparing powders for the dissolution experiments, density measurements of 6Li-Mg-EM monoliths using Archimedes' principle, tests for crystallinity using washed and sized 6Li-Mg-EM powder, and laser diffraction analysis of the particle size distribution of the washed and sized 6Li-Mg-EM fraction. 6Li-Mg-EM - ICP-MS - Blanks.xlsx: ICP-MS analysis of the blank leachates. 6Li-Mg-EM - ICP-MS - Samples.xlsx: ICP-MS analysis of the sample leachates: raw intensities, corrections and conversions to ppb, ppm plots and ratio-time plots, mass loss corrected concentrations (Ci) and concentrations normalised to the mass fractions within 6Li-Mg-EM (NCi), estimated alteration layer thicknesses from the B releases (eB), fractions of elements leached (LFi) and estimated % glass altered from B releases, normalised elemental releases (NLi) and releases rates (NRi), and retention factors (RFi). 6Li-Mg-EM - Leachate Li MC-ICP-MS.xlsx: 7Li/6Li MC-ICP-MS analysis of the 6Li-Mg-EM leachates. Concentration runs prior to isotope runs are given in 3 parts and then compiled. ISotope-concentration crossplots are also given. 6Li-Mg-EM - Pristine glass composition (EPMA and LA-ICP-MS).xlsx: EPMA analysis of polished resin-mounted 6Li-Mg-EM pieces to obtain the concentrations of all oxides except B and Li, LA-ICP-MS analysis to obtain the concentrations of B and Li (isotopes of all constituent elements were measured and normalised to the Si concentrations measured in EPMA. Li concentrations were adjusted assuming natural abundance in NIST610 and using the 7Li/6Li ratio of pristine 6Li-Mg-EM measured through alkali fusion), and the compiled 'final' composition. Li50Na50-Mg-EM - 6Li-1H CP-NMR.xlsx: 6Li-1H spectra of pristine washed and sized, 7 d 90 ‹C leached and 112 d 90 ‹C leached Li50Na50-Mg-EM (same elemental composition as 6Li-Mg-EM, but with natural abundance 7Li/6Li ratio. See Gout, T. L., Harrison, M. T., & Farnan, I. Impacts of lithium on Magnox waste glass dissolution. Journal of Non-Crystalline Solids, 517, 96-105 (2019).). Masses of powder used, number of scans, reference and scale of spectra are also given.