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pigeonite |
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pigeonite [′pij·ə‚nīt]
(mineralogy) (Mg,Fe2+,Ca)(MgFe2+)Si20Clinopyroxene mineral species intermediate in composition between clinoenstatite and diopside, found in basic igneous rocks. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | low-K tholeiite olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz medium-K calc alkaline olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz high-K calc alkaline olivine clinopyroxene pigeonite orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz Table 2. Interstitial augite and pigeonite have in part been altered to amphibole and mica. Various factors, including magma composition, control whether orthopyroxene or pigeonite occurs as the low-Ca pyroxene, but high temperatures yield orthopyroxene and low-pressure crystallization favours pigeonite. |
pigeonite |
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