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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.

[French pyroxène : Greek puro-, pyro- + Greek xenos, stranger (originally viewed as a foreign substance when found in igneous rocks); see ghos-ti- in Indo-European roots.]

py′rox·en′ic (pī′rŏk-sē′nĭk, -sĕn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Pyroxenic placer tempers are common in Fiji, but the closest place from which this sand could derive is the Navua Delta on the south coast of Viti Levu.
These may be the same as those described in the catalog note accompanying a specimen of Orford millerite which was displayed at the 1862 London International Exhibition: "there is, on the [same lot], a pale green pyroxenic rock, in which occur druses, lined with large twin crystals of white pyroxene, and with cinnamon-colored garnets" (Geological Survey of Canada, 1862).