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Named for Yves Oscar Fortier, the former director of the Geological Survey of Canada from 1964 to 1972. Found most notably from Mont Saint-Hilaire in Canada and the Lovozero Massif in Russia, Yofortierite occurs as “a late-stage hydrothermal mineral in pegmatite veins” such as at Mont Saint-Hilaire.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/yofortierite.pdf