sauvadiagrammit

Sauvadiagrammit is a mineral belonging to the silicate group, specifically a member of the amphibole supergroup. It is a rare, hydrous sodium, calcium, magnesium, iron amphibole. Its chemical formula is typically expressed as NaCa2(Mg2Fe3+)(AlSi7O22)(OH)2. It is characterized by its prismatic crystal habit and its color, which often ranges from colorless to white or pale gray. Sauvadiagrammit is known for its toughness and is generally considered to be an accessory mineral.

The mineral was first discovered in the Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. It was named in honor of the French mineralogist and crystallographer Pierre Sauvage. Sauvadiagrammit is typically found in association with other rare minerals in alkaline igneous rocks, particularly in pegmatites and related environments. Its geological occurrence is quite restricted, contributing to its rarity and interest among mineral collectors and geologists. Studies of sauvadiagrammit have provided insights into the complex crystallographic and compositional variations within the amphibole supergroup.