coltán 33
It is the name of a natural rock composed basically of columbita and tantalite in various proportions. Columbita is a Niobium oxide and tantalite is tantalum oxide and both have Iron and Manganese. The word is formed with the contraction in three letters of each mineral (iron oxides and manganese). It is a rock for the manufacture of electronic devices. In Colombia it is illegally extracted and exported by the guerrillas.