Geological and petrological aspects of grenvillian A-type topaz granites of the Bom Futuro Tin-mine, Rondônia, Brazil - Leite Junior, Washington Barbosa; Oliveira, R. C. B.; Payolla, Bruno Leonelo; Bettencourt, Jorge Silva (Symposium on Magmatism, Crustal Evolution, and Metallogenesis of the Amazonian Craton, 2006)