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Iceland spar

noun

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


Iceland spar

noun

  1. a pure transparent variety of calcite with double-refracting crystals used in making polarizing microscopes
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Iceland spar

/ īslənd /

  1. A form of calcite that is transparent and causes light passing through it to refract in two directions (forming a double image of an object seen through it). Iceland spar occurs in perfect rhombohedrons and is used in optical instruments.
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Word History and Origins

Origin of Iceland spar1

First recorded in 1820–30
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Example Sentences

Crystals like calcite, also called Iceland spar, can reveal the direction of polarization, a bit like a prism that reveals the rainbow within white light.

Light from the sky is polarised and, as he discovered in 2011, looking through a piece of Iceland spar reveals the direction of polarisation, and thus the direction of the sun, to within 5°.

Dove's Iceland spar prism is also useful, when two pigments have to be worked on to paper, so as to be complementary.

Spar, sp�r, n. a term applied by miners to any bright crystalline mineral, and adopted by mineralogists in the names of a number of minerals—calcareous spar, fluor spar, Iceland spar, &c.—adj.

He and his colleagues have been experimenting with a mineral called Iceland spar.

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