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cryolite

From The Collaborative International Dictionary of English v.0.48:

Cryolite \Cry"o*lite\ (kr[imac]"?-l?t), n. [Gr. kry`os icy cold,
   frost + -lite: cf. F. cryolithe.] (Min.)
   A fluoride of sodium and aluminum, found in Greenland, in
   white cleavable masses; -- used as a source of soda and
   alumina.
   [1913 Webster]

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