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Pegmatite dikes run through precambrian gneiss and schist

Close up of canyon wall showing pegmatite dikes running through precambrian gneiss and schist, Black Canyon of the Gunnison National Park, Colorado, USA

Colorado17A1780precambriangneissschistBlack Canyon of the GunnisonNational ParkUSABlack CanyongeologyruggedNorth AmericaNorth Americanlandscapescenicnobodycanyoncanyon wallsrockformationsgeologicPegmatite dikesPegmatitecloseupclose upwallvolcanichorizontal