'Pyrophyllite' definitions:

Definition of 'pyrophyllite'

(from WordNet)
noun
A white or greenish aluminum silicate mineral (resembles talc)

Definition of 'Pyrophyllite'

From: GCIDE
  • Pyrophyllite \Py*roph"yl*lite\, n. [Pyro- + Gr. ? leaf.] (Min.) A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina. [1913 Webster]