“…hydrothermal genesis of muscovite is also supported by low Fe concentration, since the Fe content is much higher in a typical magmatic muscovite [3]. Moreover, muscovite from the mariupolite is completely devoid of Ti, impoverished in Al and Na, what is also consistent with its post-magmatic, hydrothermal genesis [43][44][45]. The hypothetical post-magmatic origin of the mica is also consistent with its textural characteristics, as tiny, not welldeveloped flakes without characteristic twinning.…”