Granite carving by Masaji Asaga | Iwase Rock Museum, Sakuragawa, Ibaraki prefecture, Japan | 2014 | copyright
Bertram von Minden, ‘double-winged altarpiece’ 1390-1415 (detail) | Kunsthalle, Hamburg, Germany | 2018 | copyright
internet (‘Stunning combination of Rhodochrosite with Chalcopyrite, Sphalerite and Quartz from Colorado. Credit: Weinrich Minerals, Inc’) | 2018 | copyright