'Phenacite' definitions:

Definition of 'Phenacite'

From: GCIDE

Phenacite \Phen"a*cite\, n. [Gr. fe`nax, fe`nakos, impostor, deceiver.] (Min.) A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz. [1913 Webster]