it is predicted that serpentinization of peridotite causes the formation of
serpentine having elevated Fe+3/(Fe+3 + Fe+2) values, Fe-bearing brucite (at temperatures ≤ca. 320 °C), and
magnetite (at temperatures >ca. 200 °C), while serpentinization of pyroxenite does not produce magnetite,
but instead forms Fe-rich serpentine with relative low Fe+3/(Fe+3 + Fe+2) values and Fe-poor talc