Plumbopyrochlore  Columbite-(Mn)   Image

Plumbopyrochlore Columbite-(Mn) Image

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 Columbite-(Mn), Plumbopyrochlore

Large Columbite-(Mn) Image

Mineral: Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6  
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality.
Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
Scale: Picture Size 12x10 mm.
Copyright: © Pavel M. Kartashov
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