Webster’s Revised Unabridged Dictionary · 1913
Margarite
Mar′ga·rite (mär′gȧ·rīt), n. [L. margarita, Gr. μαργαρίτης 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.