Abstract
The granite pegmatite at the Golconda mine in Minas Gerais, Brazil, is a zoned, sheetlike mass in schist. Most of the estimated 1,000 metric tons of mine-crude muscovite mined since 1908 has been recovered from a mica shoot in the upper border zone. Detailed descriptions are given for garnet, cookeite, beryl, cassiterite, manganotantalite, and microlite—all of which minerals occur in the central zone.
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