Bible Dictionaries
Iceland Spar
Webster's Dictionary
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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Bibliography Information
Webster, Noah. Entry for 'Iceland Spar'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/i/iceland-spar.html. 1828.