Honestly, the first thing I thought of when I saw this is the precipice of Minis Tirath, the white city in LOTR:o) Mount Roraima is located on the triple border point between Brazil, Guyana and Venezuela.
PARAÍBA - Paraiba Tourmaline was first found in the district of São José da Batalha, in the interior of Paraíba. Brazil is rich in tourmaline, of different colors, but a variety of unique blue came the obstinacy of the miner Heitor Dimas Barbosa, who excavated for seven years until, in 1989, found a handful of tourmalines. Strange color and sent for analysis in the biggest laboratory in the world of gems, the "Gemological Institute of America." The stones were unique on the planet.