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Comments: Black, 3mm euhedral crystal of schiavinatoite in matrix.
Location: Ampanodiana Sud, Tetezantsio, Mahaiza, Madagascar.
© Tom Loomis / Dakota Matrix
Schiavinatoite: (Nb,Ta)BO4 Rynersonite: Ca(Ta,Nb)2O6
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