Abstract
Since the 18th century euclase in Brazil has been mined mainly in the reknowed mineralogical district of Ouro Preto, Minas Gerais. Three new deposits were more recently discovered in the same state: (1) In 1979-80 garimpeiros exploited about 10 kg of yellow gem-quality material and specimens for collectors, but the location of the source remained unknown in the geologic literature. It is situated near the small village of Olhos D'Agua, in Bocaiuva district, northwestern Minas Gerais; (2) Soon after the first exploitation, another euclase occurrence was discovered in the same region, some 25 km NNW of Itacambira. About 3 kg de grey-blue euclase, mostly collection specimens, have been produced. (3) Occurrences in the Gouveia district were detected by the authors during alluvial diamond prospecting. In this area the specimens have only mineralogical importance. In all localities, the mineral occurs disseminated and/or concentrated in pockets in the small feldspathic zone of pegmatoid quartz veins truncating quartzites of the Espinhaco Supergroup (Bocaiuva and Itacambira deposits) or schist and granitic rocks of the pre-Espinhaco Complex (Gouveia occurrences).
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