Martinite Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada Original description: The maximum diameter is ~ 2 1/4 mm. Via Jean-Pierre Beckerich. Found August 1992. Fairly deep to very pale violet plates of martinite. This specimen was visually confirmed (as MSH UK92) by the principal author (Dr. A. M. McDonald 2007). It is considered a very good example for the species. The martinite is from a sodalite xenolith and appears to be associated with yofortierite. According to Horváth (Lapis, Rivista 7-8/2000), yofortierite is exceedingly rare in this environment but tuperssuatsiaite has not been reported. The other (equally rare) possibility is raite – but I doubt it. Other associated minerals inlude well formed "eudialyte". — Photo: Modris Baum · Public domain
Martinite
Martinite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na, ,Ca)₁₂Ca₄(Si,S,B)₁₄B₂O₃₈(OH,Cl)₂F₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Gyrolite structural group.
IMA symbol Mrt, IMA status: approved, named in 2001.