Villiaumite is a rare halide mineral and the Na (sodium) analogue of carobbiite. It occurs in rock of nepheline-syenite composition and can bear red, pink and orange coloration. The vibrant red color of many specimens can be attributed to "radiation damage" to the crystal. Some notable locations of Villiaumite formation include Minas Gerais in Brazil, Greenland, Kenya, Namibia, Russia, Norway and the United States. It is named after the French explorer Maxime Villiaume, who collected this material from Los Islands, Guinea.
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