a transparent variety of calcite that is double-refracting and is used as a polarizer.
a pure transparent variety of calcite with double-refracting crystals used in making polarizing microscopes
Iceland spar
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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