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Iceland spar

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Iceland spar

–noun
a transparent variety of calcite that is double-refracting and is used as a polarizer.

Origin:
1820–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Iceland spar  
n.  A doubly refracting transparent calcite used in optical instruments.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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