@inproceedings{inproceedings5324a30c,
title   = {Topaz-bearing porphyritic phases within the Água Boa Granite, Pitinga tin mine, Amazonas, north Brazil},
author = {Lenharo, Sara Lais Rahal and Pollard, Peter John and Born, Helmut and Costi, Hilton Tulio},
year = {1997},
publisher = {Superintendência de Geologia e Recursos Minerais},
booktitle   = {International Symposium on Granites and Associated Mineralizations}
}