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Columbite-(Fe), Plumbopyrochlore
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| Mineral: | Columbite-(Fe): Fe++Nb2O6 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH) | |||||
| Comments: | Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)). | |||||
| Location: | Holdazan, Buregteg, Mongolia. | |||||
| Scale: | See Photo. | |||||
| Copyright: | © Jeff Weissman / Photographic Guide to Mineral Species | |||||
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