BERILOS DE PEGMATITOS DE SANTA MARIA DE ITABIRA, MINAS GERAIS - BRASIL

Abstract

Samples of beryls from three different pegmatite bodies, representative of the Santa Maria de Itabiraregion have been studied by several analytical techniques: Color, refraction, luminescence, density, IRspectrum, XRD, cell parameters, fluid inclusions and chemical composition have been considered. Theberyls have been analyzed for main elements as well as the following trace elements Na, Li, Cs, K, Rb, Ca,Ba, Zr. Fe e Ti.The pegmatites described in this paper are situated at the southeastern side of São Francisco Craton andbelong to the Eastern Pegmatite Province (PPO). They are related to a magmatism of Brasiliano age. Theyare being exploited for beryl and gems such as aquamarine, heliodor, colorless topaz and amazonite.The data are discussed and interpreted from the petrologic and metallogenetic point of view.