Source : Webster's Revised Unabridged Dictionary (1913)

Chlorite \Chlo"rite\, n. [Gr. ? (sc. ?), fr. ? light green.]
   (Min.)
   The name of a group of minerals, usually of a green color and
   micaceous to granular in structure. They are hydrous
   silicates of alumina, iron, and magnesia.

   {Chlorite slate}, a schistose or slaty rock consisting of
      alumina, iron, and magnesia.

Chlorite \Chlo"rite\, n. [Chlorous + -ite.] (Chem.)
   Any salt of chlorous acid; as, chlorite of sodium.

Source : WordNet®

chlorite
     n : a generally green or black mineral; it occurs as a
         constituent of many rocks typically in the form of a flat
         crystal