{ Cas″tor, Cas″tor‐ite (?), } n. [The minerals castor and pollux were so named because found together on the island of Elba. See Castor and Pollux.] (Min.) A variety of the mineral called petalite, from Elba.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.