I have seen fragments of quartz traversed by parallel bands of magnetic iron, carried into the valley of Caracas by the waters descending from the Galipano and the Cerro de Avila.
Defn: A board or boarding which marks or forms the head of anything; as, the headboard of a bed; the headboard of a grave.
Defn: A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "magnetic iron" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.