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1 - silicates: The most abundant mineral group is the silicates in the earth's crust. Basically they are Composed by Silicon and other elements. They differ in his high hardness and Insolubility in the acids. The most important are:
Quartz, Opal, Feldspar, Talc, Mica, Anfiboles, Wollastonita, Tourmaline, Beryl, Olivino, Andalucita, Garnet.