ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Monazite crystals. Monazite is a rare earth phosphate, containing varying proportions of cerium, lanthanum, neodymium and thorium phosphates. It varies in colour from yellow to brownish-red and is the main cerium and thorium ore. This specimen measures 2 x 1.5 cm and was found in Buenopolis, Minas Gerais, Brazil.
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