Pollucite \Pol"lu*cite\, n. [See {Pollux}, and 4th {Castor}.] (Min.) A colorless transparent mineral, resembling quartz, occurring with castor or castorite on the island of Elba. It is a silicate of alumina and c[ae]sia. Called also {pollux}. [1913 Webster]
Pollux \Pol"lux\, n. [L., the twin brother of castor; also, the constellation.] 1. (Astron.) A fixed star of the second magnitude, in the constellation Gemini. Cf. 3d {Castor}. [1913 Webster] 2. (Min.) Same as {Pollucite}. [1913 Webster]