DIAMANTINA (formerly called Tejuco), a mining town of the State of Minas Geraes, Brazil, in the north-eastern part of the State, 3, 71 of t. above sea-level. Pop. (1890) 7,75o; the munici pality 69,445. Diamantina is built partly on a steep hillside over looking a small tributary of the Rio Jequitinhonha (where dia mond-washing was once carried on), and partly on the level plain above. The town is roughly but substantially built, with broad streets and large squares. It is the seat of a bishopric, with an episcopal seminary, and has many churches, a lunatic asylum, a theatre, military barracks, hospitals and a secondary school. There are several small manufactures, including cotton-weaving; and diamond-cutting is carried on. Diamantina is the commercial centre of an extensive region, and has long been noted for its wealth. The present name of the town was assumed (instead of Tejuco) in 1838, when it was made a cidade. (See MINAS GERAES. )