Citation: Piilonen, P. C.; Lalonde, A. E.; McDonald, A. M.; Gault, R. A. (2000). Niobokupletskite, a new astrophyllite-group mineral from Mont Saint-Hilaire, Quebec, Canada: Description and crystal structure Locality: Mont Saint-Hilaire, Quebec, Canada. The Canadian Mineralogist, 38, pp. 627-639.