NON-METALLIC MINERALS 331 



Couto (Minas) Prates (Minas) 



Miranda (Minas) Silveira (Minas) 



Some of the leucite-bearing rocks of Brazil may yet become available 

 for the maniifacture of potash. Foyite containing 8.78 per cent of potash 

 (KsO)^ and leucite-tinguaite containing 8.86 per cent of potash, are 

 found in the Serra do Tingua in the State of Eio de Janeiro ; lencitophyre, 

 with 8.12 per cent, is found at Pogo de Caldas, and lencite granite por- 

 phyry, with 8.80 per cent of potash (K2O), is found on Eio Pardo in the 

 Serra de Caldas. The last two places are in southwestern Minas Geraes. 



Graphite. — Graphite is found in Archean rocks in Minas near Sao 

 MigueP* and about Minas Novas, but it is not known to have been mined. 

 It is reported near Abrantes, northeast of Bahia. Freise reports it from 

 Espirito Santo and Wells reports it from east of Chapada, in the State 

 of Maranhao.^^ It seems to be confined to the areas of the Brazilian 

 complex. 



Bauxite. — Bauxite has been found in southwestern Minas, in the vicin- 

 ity of Pogo de Caldas, where it is derived by decomposition from alkaline 

 igneous rocks. Doctor Lisboa reports it in the State of Maranhao. It 

 occurs in the form of sedimentary deposits along some of the tributaries 

 of the lower Amazon Eiver, in the State of Para. It has not yet been 

 worked anywhere in Brazil. 



Later discoveries made in Minas lead to the reasonable expectation that 

 extensive beds may yet be found in Brazil. See under Minas Geraes. 



Monazite. — The monazite deposits of Brazil have been known and 

 worked only since 1888. They occur as beach sands that have been 

 washed directly from Tertiary sediments that were derived originally 

 from the underlying crystalline rocks of the Brazilian complex where it 

 is a wide-spread rock constituent. The deposits that are worked are 

 along the beach in the vicinity of Prado, §tate of Bahia, and on the coast 

 of Espirito Santo north of Victoria. In the first volume of his "Minas 

 do Brasil e sua legislagao, Dr. Joao P. Calogeras gives a good resume of 

 the subject at pages 447-477 and adds a brief bibliography. 



Bohm 



Bulhoes 



Derby 



Britto 



Calogeras 



Furniss 



Gorceix 



Medrado 



Richardson 



Hussak and 



Murtinho 



Uhlig 



Reitinger 



Praguer 





Lisboa 







8* J. C. da Costa Sena : Annaes da Escola de Minas, vol. ii, 1883, pp. 125, 129. 

 ^ J. W. Wells : Three thousand miles, etc., vol. ii, p. 260. 



