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

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, 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

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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