ilmenite
    n 1: a weakly magnetic black mineral found in metamorphic and
         plutonic rocks; an iron titanium oxide in crystalline form;
         a source of titanium

Illy \Il"ly\, adv. [A word not fully approved, but sometimes
   used for the adverb ill.]
   [1913 Webster] Ilmenite \Il"men*ite\, n. [So called from
   Ilmen, a branch of the Ural Mountains.] (Min.)
   Titanic iron. See Menaccanite.
   [1913 Webster]

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]