Definition of Iceland spar in English:

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Iceland spar

Pronunciation: /ˈīslənd spär/

noun

A transparent variety of calcite, showing strong double refraction.
Example sentences
  • Nodules filled with clear double-refractive Iceland spar with celadonite inclusions have also been found here.
  • The large, transparent crystals known as Iceland spar, however, are pure calcite.
  • Certain crystals will split incoming light into two separate rays; Iceland spar is one such crystal, as are calcite and quartz.
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