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2 definitions found
 for Cassiterite
From The Collaborative International Dictionary of English v.0.48 :

  Cassiterite \Cas*sit"er*ite\, n. [Gr. ? tin.] (Min.)
     Native tin dioxide; tin stone; a mineral occurring in
     tetragonal crystals of reddish brown color, and brilliant
     adamantine luster; also massive, sometimes in compact forms
     with concentric fibrous structure resembling wood ({wood
     tin), also in rolled fragments or pebbly ({Stream tin}). It
     is the chief source of metallic tin. See Black tin, under
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a hard heavy dark mineral that is the chief source of tin

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