Abstract
Motukoreaite occurs in fractures and amygdules in hyaloclastite dredged from the western Mediterranean. Motukoreaite apparently forms as a low-temperature alteration product during seawater-basaltic glass interaction. We report microprobe chemical analyses and the complete X-ray powder-diffraction pattern of motukoreaite to enable unambiguous identification in future work on submarine alteration of basaltic glasses. Comparison of our X-ray data and analysis of motukoreaite and “unknown minerals” published by several authors suggests that motukoreaite is a common basaltic alteration mineral having a widespread occurrence.
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