Pyroxene
The pyroxenes (of the Greek πυρ, fire, and ξενος, foreigner, “foreigner with fire”) are a family of Minéraux group of the Inosilicate S. They are current components of the igneous rocks and metamorphic. They are related with the amphiboles, from which they are characterized in particular by their character Anhydre (absence of groups OH) and their angle from directions from Clivage.
The structure of pyroxenes is that of simplest inosilicates the, i.e. an assembly of simple chains of tetrahedral complexes. So the Si/O report/ratio is worth 1/3, with one period of chain of (). The general formula of a pyroxene is consequently, where X is a large Cation (Na + , Ca + , Li + , Mg 2+ , Fe 2+ , Mn 2+ …) and Y a cation of intermediate size (Mg 2+ , Fe 2+ , Mn 2+ , Fe 3+ , Al 3+ , Cr 3+ , Ti 4+ …)
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