Poudretteite
Poudretteite is an extremely rare mineral and gemstone that was first discovered as minute crystals in Mont [St. Hilaire], Quebec, Canada, 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 based Salmon Mining Industries Inc. Poudretteite has a barely detectable radioactivity.