Definitions for iceland spar
Random House Webster's College Dictionary
a transparent variety of calcite that is double-refracting and is used as a polarizer.
Origin of Iceland spar:
a transparent calcite found in Iceland and used in polarizing microscopes
A transparent form of calcite, used to demonstrate the polarisation of light.
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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