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pyroxene (n.)

type of mineral, 1800; from Greek pyr "fire" (see pyro-) + xenos "stranger" (see xeno-). According to OED, so named in 1796 by Abbé Haüy, French mineralogist, "because he thought it 'a stranger in the domain of fire' or alien to igneous rocks." Related: Pyroxenic.

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Definitions of pyroxene from WordNet

pyroxene (n.)
any of a group of crystalline silicate mineral common in igneous and metamorphic rocks;
From wordnet.princeton.edu