Pyroxene

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Figure 1: A sample of pyroxenite, a rock consisting mostly of pyroxene minerals.

The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. They share a common structure consisting of single chains of silica crystals with the general formula XY(Si,Al)2O6 where X and Y represents metal ions. Although aluminium substitutes extensively for silicon in silicates such as feldspars and amphiboles, the substitution occurs only to a limited extent in most pyroxenes.

Pyroxenite is an igneous rock made up of minerals from the pyroxene group.