  The amazing possibility of magnetoelectric crystals to cross couple electric
and magnetic properties without the need of time-dependent Maxwell's equations
has attracted a lot of interest in material science. This enthusiasm has
re-emerged during the last decade where magnetoelectric and multiferroic
crystals have captivated a tremendous number of studies, mostly driven by the
quest of low-power-consumption spintronic devices. While several new candidates
have been discovered, the desirable magnetoelectric coupling at room
temperature is still sparse and calls for new promising candidates. Here, we
show from first-principles studies that the troilite phase of the iron sulfide
based compounds, one of the most common mineral of Earth, Moon, Mars or
meteors, is magnetoelectric up to temperatures as high as 415 K.
