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pollucite

/ˈpɒljʊˌsaɪt; pəˈluːˌsaɪt/
noun
1.
a colourless rare mineral consisting of a hydrated caesium aluminium silicate, often containing some rubidium. It occurs in coarse granite, esp in Manitoba, and is an important source of caesium. Formula: CsAlSi2O6.1/2H2O
Word Origin
C19: from Latin polluc-, stem of Pollux + -ite1; originally called pollux, alluding to Castor and Pollux, since it was associated with another mineral called castor or castorite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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