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
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.
- I cell
I cell n. See inclusion cell.
- Ice lolly
noun 1. (Brit, informal) an ice cream or water ice on a stick Also called lolly US and Canadian equivalent (trademark) Popsicle
1. Intergovernmental Committee for European Migration 2. International Conference on Emergency Medicine
- Ice machine
noun 1. a machine that automatically produces ice for use in drinks, etc