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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ice·land spar Min. A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction.  Cf. Calcite.
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From: WordNet (r) 2.0

 Iceland spar
      n : a transparent calcite found in Iceland and used in
          polarizing microscopes