TY  - JOUR 
T1  - Chemical composition of gahnite and degree of pegmatitic fractionation in the Borborema Pegmatitic Province, northeastern Brazil
JO  - Anais da Academia Brasileira de Ciências
A1  - Soares, Dwight R.
A1  - Beurlen, Hartmut
A1  - Ferreira, Ana C.M.
A1  - da-Silva, Marcelo R.R.
SN  - 0001-3765
UL  - 10.1590/S0001-37652007000300005
VL  - 79 
Y1  - 2007
PB  - Brasil 
ER  -