Back in 1987 when we were all getting excited about the Nova Era alexandrite find in Brazil, there was a new find of tourmaline in Paraíba, Brazil.
Paraíba is in what Brazilians call the Nordeste (Northeast). Looking at a map of South America Paraíba is a small Brazilian state that sticks out about as far East as any part of the continent. The Nordeste is a generally dry area (they grow cotton in the Nordeste [does this remind anyone of Arizona and cotton]). Apparently the Nordeste is in the rain shadow of South America. If you also look at the shape of South America and Africa you can see that Paraíba fits nicely into the area of Africa now known as Nigeria.