4562 Obradovicite Group, Gypsum, Chuquicamata Mine, Calama, El Loa Province, Antofagasta Region, Chile May 27, 2025 Steve Chile South America Yellow-green crust of one of the Obradovicite Group species with minor white gypsum. Ex Jim Daly. Width of view 9mm. Stack of 40 images. Click on the image below for a higher resolution version. Stacked from 40 images. Method=B (R=8,S=4)
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