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Tapiolite-(Mn): (Mn++,Fe++)(Ta,Nb)2O6 Tapiolite: (Fe,Mn)(Ta,Nb)2O6
Comments: Black opaque resinous massive manganotapiolite. Location: Skogbole Mine, Kimito, Turku ja Pori, Finland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species