Poudretteite is an extremely rare mineral and gemstone that was first discovered as minute crystals in Mont St. Hilaire,

Quebec Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

, during the 1960s. The mineral was named for the Poudrette family because they operated a quarry in the Mont St. Hilaire area where poudretteite was originally found, and the quarry is currently owned by the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

based Salmon Mining Industries Inc. Poudretteite has a barely detectable radioactivity. Multicolour – Poudretteite

References

Hexagonal minerals Minerals in space group 192 Potassium minerals Cyclosilicates Gemstones {{silicate-mineral-stub