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Rynersonite: Ca(Ta,Nb)2O6
Comments: Off-white fibrous rynersonite. Location: Brown Derby No. 1 Mine, Gunnison County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rynersonite: Ca(Ta,Nb)2O6 Schiavinatoite: (Nb,Ta)BO4
Comments: Brown, columnar schiavinatoite with minor white rynersonite sticks on quartz. Location: Ampanodiana Sud, Tetezantsio, Mahaiza, Antananarivo, Madagascar. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species