Polariser is frequently a specially made prism from crystal of Iceland Spar (form of calcium carbonate), also known as Nicol’s prism. It can also be a small plate of tourmaline.
Generalic, Eni. "Polariser." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. 2 Apr. 2025. <https://glossary.periodni.com>.
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Periodic Table