# Tyndall stone

> Trademark of limestone from Canada

**Wikidata**: [Q7860463](https://www.wikidata.org/wiki/Q7860463)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tyndall_stone)  
**Source**: https://4ort.xyz/entity/tyndall-stone


## References

1. [Source](https://iugs-geoheritage.org/geoheritage_stones/tyndall-stone/)