Pre-edge portion of the XANES spectrum of plagioclase in RA-QD02-0100. Fe2+ and Fe3+ positions are from the amphibole standards whose Fe3+/(Fe2+ and Fe3+) ratios have been well determined by wet chemistry (Monkawa et al. 2006; Satake et al. 2014). The presence of two peaks corresponding to Fe2+ and Fe3+ is obvious.