单词	Iceland spar
释义	Iceland spar /ˈʌɪslənd / noun [mass noun] A transparent variety of calcite, showing strong double refraction.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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