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Mineralpedia Details for Gerasimovskite

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Gerasimovskite

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

Formula
Mn2+Nb5O12ยท9H2
Crystal System
No Crystals 
Crystal Habit
Platy, Metamict 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brown, gray, light gray 
Class
Amorphous - No Crystals 
Hardness
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Gerasimovskite from Umbozero mine, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Gerasimovskite
            from Umbozero mine, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Large grey platy crystals to 1.5cm. Excellent rich specimen.

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Gerasimovskite from Maly Punkauaiv Mountain, Lovozero Massif, Kola Peninsula, Russia

Gerasimovskite
            from Maly Punkauaiv Mountain, Lovozero Massif, Kola Peninsula, Russia

Large 1.5cm cleavage plate in Ussingite matrix. 

Click thumbnail images for larger view.

Gerasimovskite from Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia

Gerasimovskite
            from Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia

Very thin silvery light gray platy crystals to 1cm in Ussingite matrix.

Click thumbnail images for larger view.

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