Hypertext Webster Gateway: "Castorite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Castor \Cas"tor\, Castorite \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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