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Zirconolite-3O: (Ca,Fe,Y,Th)2Fe(Ti,Nb)3Zr2O7
Comments: Brown needles of zirconolite-3O in quartz matrix. Location: In den Dellen, Mendig, Laacher See, Eifel, Germany. Scale: Specimen Size < 1x1 cm. © Diederik Visser