Iceland-spar definition

īslənd
A doubly refracting transparent calcite used in optical instruments.
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A transparent, colorless calcite, found esp. in Iceland: it is used by opticians for making double-refracting prisms.
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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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A transparent form of calcite, used to demonstrate the polarisation of light.
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