PYROXENE
Pyroxene
The pyroxenes are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks. They share a common structure consisting of single chains of silica tetrahedra and they crystallize in the monoclinic and orthorhombic systems. Pyroxenes have the general formula XY2O6 (where X represents calcium, sodium, iron+2 and magnesium and more rarely zinc, manganese and lithium andThe above text is a snippet from Wikipedia: Pyroxene
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pyroxene
Noun
The above text is a snippet from Wiktionary: pyroxene
and as such is available under the Creative Commons Attribution/Share-Alike License.