Poudretteite

Poudretteite is a rare cyclosilicate mineral with the chemical formula KNa2Ca2Si6O15. It was first discovered in the Mont Saint-Hilaire intrusive complex in Quebec, Canada, and was named after the Poudrette family, who owned the quarry at the time. The mineral is characterized by its vitreous luster and typically occurs in prismatic or tabular crystals. Poudretteite is a member of the tourmaline supergroup and is known for its distinctive pink to purplish-red color, which is attributed to the presence of manganese impurities.

The geological formation of poudretteite is associated with alkaline igneous rocks, specifically within the pegmatite and hydrothermal veins of these environments. Its rarity makes it highly sought after by mineral collectors and gem enthusiasts. When found in gem quality, poudretteite can be faceted, although its brittle nature requires careful handling. The primary occurrence of poudretteite is in the Mont Saint-Hilaire region of Quebec, though small deposits have also been reported in other locations worldwide. Its crystallography is complex, with a trigonal crystal system. Due to its scarcity, research on its physical and chemical properties is ongoing.