The Collaborative International Dictionary of English v.0.48:

Menaccanite \Me*nac"can*ite\, n. [From Menaccan, in Cornwall,
   where it was first found.] (Min.)
   An iron-black or steel-gray mineral, consisting chiefly of
   the oxides of iron and titanium. It is commonly massive, but
   occurs also in rhombohedral crystals. Called also titanic
   iron ore, and ilmenite.
   [1913 Webster]