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(Portuguese pjaˈui)
(Placename) a state of NE Brazil, on the Atlantic: rises to a semiarid plateau, with the more humid Paranaíba valley in the west Capital: Teresina. Pop: 2 898 223 (2002). Area: 250 934 sq km (96 886 sq miles)



a state in NE Brazil. 2,676,098; 96,860 sq. mi. (250,870 sq. km). Cap.: Teresina.
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Some of the pink beryl can be treated by a proprietary process to produce a deep cobalt-blue or indigo-blue color similar to that of the famous Maxixe-mine beryl found in the Piauhy area in 1917.