“…Dyar et al 434 (1987) also observed that wet chemical analyses yielded higher Fe 3+ , however, 435 their Fe 3+ contents were not directly from the fit of Mössbauer spectra. Similarly, 436 Jayasuriya et al (2004) showed that Fe 3+ /ΣFe in synthetic basaltic glasses 437 20 calculated from RT Mössbauer gave similar results to Fe 3+ /ΣFe calculated from 438Mössbauer spectra taken at 4.2 K, but both their RT and low temperature spectra 439 are complicated by strong non-paramagnetic components, which introduce 440 ambiguity to quantification of Fe 3+ /ΣFe(Zhang et al, 2015). Thus, there is no 441 consensus in the literature regarding whether Mössbauer and wet chemical 442 methods are consistent, or even in which direction the results may be biased.…”