noun
: a series of isomorphous minerals in the spinel group consisting of magnetite, magnesioferrite, franklinite, jacobsite, trevorite, and maghemite
noun
: a series of isomorphous minerals in the spinel group consisting of magnetite, magnesioferrite, franklinite, jacobsite, trevorite, and maghemite
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012