'Cordierite' definitions:

Definition of 'cordierite'

(from WordNet)
noun
A blue mineral of magnesium and iron and aluminum and silicon and oxygen; often used as a gemstone

Definition of 'Cordierite'

From: GCIDE
  • Cordierite \Cor"di*er*ite\ (k[^o]r"d[i^]*[~e]r*[imac]t), n. [Named after the geologist Cordier.] (Min.) See Iolite. [1913 Webster]