Special member state territories and the European Union claim of Adélie Land in Antarctica) is a French Overseas Territory but has no permanent population. It has "sui generis" status within France. Saint-Pierre and Miquelon, Saint Barthélemy, French Polynesia, and Wallis and Futuna are overseas collectivities (formerly referred to as overseas territories) of France, while New Caledonia is a ""sui generis" collectivity". Saint Barthélemy and Saint-Pierre and Miquelon use the euro, while New Caledonia, French Polynesia and Wallis and Futuna use the CFP Franc, a currency which is tied to the euro and guaranteed by France. Natives of the collectivities are European citizens owing to their French citizenship and
Geography of New Caledonia in Oman in the 1970s, New Caledonia has the planet's largest known outcrop of ultrabasic rock, derived not from the crust, but from an upthrust fold of the more deeply underlying mantle of the earth. These mineral-rich rocks are a source of nickel, chromium, iron, cobalt, manganese, silver, gold, lead and copper. The toxicity of the mineral-rich soil has helped preserve the endemic vegetation, which has long been adapted to it, from competition from would-be colonizers which find it unsuitable. Anthropologically, New Caledonia is considered the southernmost archipelago of Melanesia, grouping it with the more close-by islands to its north,