Source : Webster's Revised Unabridged Dictionary (1913)

Margarite \Mar"ga*rite\, n. [L. margarita, Gr. ? a pearl; cf. F.
   marguerite.]
   1. A pearl. [Obs.] --Peacham.

   2. (Min.) A mineral related to the micas, but low in silica
      and yielding brittle folia with pearly luster.