Hydroterskite is a rare zirconium silicate mineral, related to terskite (hence its name), with the formula Na2ZrSi6O12(OH)6. It was discovered in the Saint-Amable sill near Montréal, Québec, Canada.Grice, J.D., Rowe, R., and Poirier, G., 2015. Hydroterskite, IMA 2015-042. (2015) Hydroterskite, IMA 2015-042. CNMNC Newsletter No. 27, October 2015, 1224; Mineralogical Magazine 79, 1229-1236 It is hydrous, when compared to terskite. Chemically similar minerals include litvinskite and kapustinite.
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