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Iceland spar

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Iceland spar \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}.

資料來源 : WordNet®

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