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Uranmicrolite: (U,Ca)2(Ta,Nb)2O6(OH)
Comments: lack crystals of (most probably) uranmicrolite [originallly labeled samarskite-(Y)) in purple lepidolite matrix. Location: Brown Derby Mine, Ohio City, Quartz Creek District, Gunnison Co., Colorado, USA. Scale: Specimen Side 3x3x2 cm. © John Betts - Fine Minerals