Tantalum in Brazil is often found associated with the pegmatite body,
which is formed by quartz, feldspar, beryl, and mica.
The Tantalum grades in Brazil vary according to the region and their occurrences.
Paraíba and Rio Grande do Norte have higher grades, ranging from 20 to 45% Ta2O5,
while in Amapá and Pará, the average is 10 to 18% Ta2O5,
usually associated with variations of tin (SnO2) and higher grades of Nb2O5.
When the Ta2O5 content is higher than Nb2O5, it is called tantalite,
and when the opposite occurs, with Nb2O5 being higher, it is columbite.
Ann: Lidar Survey to commence at Summit's Equador Niobium Project, page-39
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