Mineralpedia Details for Gerasimovskite
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
Gerasimovskite from Umbozero mine, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia
Large grey platy crystals to 1.5cm. Excellent rich specimen.
Gerasimovskite from Maly Punkauaiv Mountain, Lovozero Massif, Kola Peninsula, Russia
Large 1.5cm cleavage plate in Ussingite matrix.
Gerasimovskite from Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia
Very thin silvery light gray platy crystals to 1cm in Ussingite matrix.