(definition) by Webster 1913 Tue Dec 21 1999 at 22:22:59

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.

 

© Webster 1913.

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