Diamond type
Diamond type is a method of scientifically classifying diamonds by the level and type of their chemical impurities. Diamonds are separated into four types: Type Ia, Type Ib, Type IIa, and Type IIb. The impurities measured are at the atomic level within the crystal lattice of carbon atoms and so, unlike inclusions, require an infrared spectrometer to detect.
Niquelândia
Although mining is practically all done for nickel, there are also more than 120 types of mineral, such as gold, crystal, platinum, copper, mica, iron, manganese, diamonds, quartz, marble, cobalt, asbestos and even uranium.