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X-ray powder diffractogram of bulk powder of sample 10. Mineral symbols on the peaks are clinopyroxene (C), nontronite (N), olivine (O), plagioclase feldspar (P), and zeolite, best match to chabazite (Z). Significant background intensity is related to amorphous and/or nanophase Fe hydroxides (Moore and Reynolds, 1997), which are common alteration products of basaltic glass and are difficult to analyze via standard XRD methods (Bishop et al., 2002c).
