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Columbite-(Mn), Plumbopyrochlore
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| 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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