magnetites

Noun

magnetite (plural magnetites)

1. A magnetic mineral, with the chemical formula Fe²⁺Fe3+2O₄, one of the primary ores of iron.
   • Appropriately enough, the commonest of these, a simple iron oxide, is called magnetite.2004, Richard Fortey, The Earth, Folio Society, published 2011, page 137

   Synonyms:

   lodestone

2. (broadly) Any instance of iron(II,III) oxide, regardless of whether it is a geologic mineral or a chemical result or product.