The exposition “Precious Brazil: the wealth of gem-minerals” presents a small sample of the great gemological variety found in brazilian territory. Within this thematic clipping, the MM Gerdau will show a part of its collection aiming to present Brazil as one of the biggest gem mineral exportation countries in the world and as an important place of first occurrence of some kinds of gem minerals such as: Brazilianite, Euclase and Paraiba Tourmaline .The Brazil’s precious stones production is mostly done by garimpeiros (kind of independent prospectors) and occurs widely spread in many states, for instance, Bahia, Espírito Santo, Goiás, Pará, Piauí, Rio Grande do Sul, Tocantins and mainly in Minas Gerais, from where the majority of variety of gem minerals comes from.
Bicolor Tourmaline. They can incorporate a range of chromophore chemical elements such as Iron, Manganese, Titanium and Cupper, being capable of presenting color zoning in a single crystal. Chemical composition: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) - Silicates.
