Pyroxene definitions

pī-rŏk'sēn'
Any of a group of crystalline silicate minerals common in igneous and metamorphic rocks and containing two metallic oxides, as of magnesium, iron, calcium, sodium, or aluminum.
noun
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Any of a group of monoclinic or orthorhombic silicate minerals usually containing iron or magnesium but not the hydroxyl radical, and commonly found in igneous rocks.
noun
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Any of a series of dark silicate minerals having the general chemical formula ABSi2 O6 , where A is either calcium (Ca), sodium (Na), magnesium (Mg), or iron (Fe), and B is either magnesium, iron, chromium (Cr), manganese (Mn), or aluminum (Al). Pyroxenes vary in color from white to dark green or black and are characterized by a rectangular-shaped cross section. They can be either monoclinic or orthorhombic and occur in igneous and metamorphic rocks. The minerals enstatite, diopside, and augite are pyroxenes.
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(mineralogy) Any of a group of crystalline minerals containing silicates of iron, magnesium and calcium.
noun
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Origin of pyroxene

French pyroxène Greek puro- pyro- Greek xenos stranger (originally viewed as a foreign substance when found in igneous rocks) ghos-ti- in Indo-European roots