Iceland spar

Iceland spar
a crystalline form of calcium carbonate, usually found in Iceland, and used in making Nicol prisms.

Medical dictionary. 2011.

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  • Iceland spar — Ice land spar (Min.) 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}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Iceland spar — n. a transparent, colorless calcite, found esp. in Iceland: it is used by opticians for making double refracting prisms …   English World dictionary

  • Iceland spar — Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico, United States. This 35 pound (16 kg) crystal, on display at the National Museum of Natural History, is one of the largest single crystals in the United States. Iceland spar,… …   Wikipedia

  • Iceland spar — noun A transparent form of calcite, used to demonstrate the polarisation of light. portions of the original aragonite which make up the nacreous layers of the pearl had, through “induced paramorphism,” as it was known to the artful sons of Nippon …   Wiktionary

  • Iceland spar — islandiškasis špatas statusas T sritis chemija apibrėžtis Kristalinis skaidrus kalcitas, mineralas. formulė CaCO₃ atitikmenys: angl. Iceland spar rus. исландский шпат …   Chemijos terminų aiškinamasis žodynas

  • iceland-spar — n. Calcareous spar, crystallized carbonate of lime, Iceland crystal …   New dictionary of synonyms

  • Iceland spar — Ice′land spar′ n. mir a transparent variety of calcite that is double refracting and is used as a polarizer • Etymology: 1820–30 …   From formal English to slang

  • Iceland spar — a transparent variety of calcite that is double refracting and is used as a polarizer. [1820 30] * * * also called  Iceland Crystal,         a transparent calcite used for polariscope prisms. See calcite. * * * …   Universalium

  • Iceland spar — noun Date: 1771 a birefringent transparent colorless variety of calcite …   New Collegiate Dictionary

  • Iceland spar — calcite (calcium carbonate) …   Eponyms, nicknames, and geographical games

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