| Iceland spar n. A doubly refracting transparent calcite used in optical instruments. |
Iceland spar ( s l nd) 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | Iceland spar - a transparent calcite found in Iceland and used in polarizing microscopes calcite - a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone |
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