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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). iceland spar. Retrieved September 26, 2026, from http://smartdefine.org/iceland_spar/definitions/2018595 |
| Chicago | Webster's. 2011. "iceland spar" http://smartdefine.org/iceland_spar/definitions/2018595 (accessed September 26, 2026). |
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| MLA | Webster's. "iceland spar" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/iceland_spar/definitions/2018595> |