What is the meaning of 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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APAWebster's. (2011). iceland spar. Retrieved September 26, 2026, from http://smartdefine.org/iceland_spar/definitions/2018595
ChicagoWebster's. 2011. "iceland spar" http://smartdefine.org/iceland_spar/definitions/2018595 (accessed September 26, 2026).
HarvardWebster's 2011, iceland spar, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/iceland_spar/definitions/2018595>.
MLAWebster's. "iceland spar" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/iceland_spar/definitions/2018595>
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