Photograph caption – the Merensky Reef basal chromitite exposed underground (M W Knoper). Much of the world's platinum is found associated with the basal chromitite layer of the Merensky Reef in the Bushveld Complex. The basal chromitite is the thin dark band about 0.5 cm thick near the center of the photo, between the dark Merensky Pyroxenite and the light-colored footwall anorthosite. Platinum group minerals often found here include PGM phases such as isoferroplatinum, maslovite, sperrylite, cooperite, and braggite.
Photograph caption – the Steenkampskraal monazite orebody exposed underground (M W Knoper). Monazite, a mineral rich in the light rare earth elements cerium, lanthanum, and neodymium, is the most common REE ore mineral found at Steenkampskraal, a REE ore deposit located in the Western Cape Province of South Africa. The brown-colored region in the bottom half of the photograph is composed of fine-grained monazite-(Ce) and apatite, whereas (the more reflective) quartz-rich zones are proximal to concentrations of magnetite and chalcopyrite. The pencil magnet is about 10 cm in length.