Experimental Data on (Ni,Fe)-Bearing Phases: Chemical Compositions (Table S1), Olivine Raman Frequencies (Table S2), and Raman Peak Positions for Olivine, Spinel, and Pyroxene (Figure S1)

This dataset is provided to support the associated manuscript “Stability of (Ni, Fe)-olivine and implications for Ni distribution in the Earth’s upper mantle.” 1. Table S1 – Chemical compositions (electron microprobe data)Major element compositions (NiO, FeO, SiO₂ in wt%) with standard deviations for three phase types: olivine-type, spinel-type, and pyroxene-type. 2. Table S2 – Raman spectroscopic frequencies for (Ni,Fe)-olivineFrequencies (cm⁻¹) of the two major vibrational modes (ν₁ and ν₃) corresponding to symmetric and asymmetric stretching of SiO₄ tetrahedra. The Ni/(Ni+Fe) molar ratios, calculated from Table S1, are also provided. 3. Figure S1 – Representative Raman spectra for three phase typesRepresentative Raman spectra of (Ni, Fe)-olivine (SS06), (Ni, Fe)-spinel (SS07), and (Ni, Fe)-pyroxene (SS10) samples synthesized through the high-temperature and high-pressure experiments