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Named after Vasily Ivanovich Gerasimovskii, a Russian mineralogist and geochemist who discovered several new minerals from the Lovozero Massif on the Kola Peninsula in Russia. Localities for Gerasimovskite include in Greenland at the Ilimaussaq complex and in Russia in the Khibiny and Lovozero massifs. It is a secondary mineral that forms by the hydrothermal alteration of niobium-titanium minerals within ussingite-bearing pegmatites.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/gerasimovskite.pdf
Named for the type locality at the Getchell mine in Humboldt County in Nevada, USA. Getchellite forms at its type locality “in an epthermal gold deposit formed in a narrow, steeply-dipping fault zone cutting interbedded, [presumably] Paleozoic shales, argillites, and limestones near a granodiorite intrusive.” Localities include in Iran, Russia, Kyrgyzstan, Japan, and newer localities in Pakistan, France, China, and Azerbaijan.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/getchellite.pdf