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1. (n.) Iceland spar
a transparent variety of calcite that is double-refracting and is used as a polarizer.
Etymology: (1820–30)
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| Definition of 'iceland spar' |
Princeton's WordNet |
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1. (noun) Iceland spar
a transparent calcite found in Iceland and used in polarizing microscopes
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| Definition of 'iceland spar' |
Webster Dictionary |
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1. iceland spar
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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Definitions of iceland spar 
