castorite ['kæstәˏrait]
透锂长石
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.