Sony Alpha 7R ii, bellows, Mitutoyo M Plan 20x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control. Minute brown Rooseveltite crystals. Collection and photo Stephan Wolfsried; Locality: Alcantarilla mine, Belalcázar, Córdoba, Andalusia, Spain; Fov: 0.8 mm; 4/2017
Copyright: Stephan Wolfsried