| Mineral: | Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6
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| 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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