[pahy-rok-seen, puh-, pahy-rok-seen]
any of a very common group of minerals of many varieties, silicates of magnesium, iron, calcium, and other elements, occurring as important constituents of many kinds of rocks, especially basic igneous rocks.

1790–1800; < French; see pyro-, xeno-; orig. supposed to be a foreign substance when found in igneous rocks

pyroxenic [pahy-rok-sen-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyroxene (paɪˈrɒksiːn)
any of a group of silicate minerals having the general formula ABSi2O6, where A is usually calcium, sodium, magnesium, or iron, and B is usually magnesium, iron, chromium, manganese, or aluminium. Pyroxenes occur in basic igneous rocks and some metamorphic rocks, and have colours ranging from white to dark green or black. They may be monoclinic (clinopyroxenes) or orthorhombic (orthopyroxenes) in crystal structure. Examples are augite (the most important pyroxene), diopside, enstatite, hypersthene, and jadeite
[C19: pyro- + -xene from Greek xenos foreign, because it was mistakenly thought to have originated elsewhere when found in igneous rocks]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pyroxene   (pī-rŏk'sēn')  Pronunciation Key 
Any of a series of dark silicate minerals having the general chemical formula ABSi2O6, 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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They measure that amount with the probe, which detects the ratios of minerals called olivine, pyroxene and feldspar.
Commonly interlayered with amphibolite or pyroxene amphibolite.
Common minerals include plagioclase feldspar, pyroxene, and amphibole.
Common minerals in basalt include olivine, pyroxene, and plagioclase.
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