# Nicol prism

> optical polarizer made of two birefrengent calcite crystals

**Wikidata**: [Q1343878](https://www.wikidata.org/wiki/Q1343878)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Nicol_prism)  
**Source**: https://4ort.xyz/entity/nicol-prism


## References

1. Freebase Data Dumps. 2013