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pigeonite

   Also found in: Wikipedia 0.03 sec.
pigeonite [′pij·ə‚nīt]
(mineralogy)
(Mg,Fe2+,Ca)(MgFe2+)Si20Clinopyroxene mineral species intermediate in composition between clinoenstatite and diopside, found in basic igneous rocks.


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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.
Igneous rock associations 4. Oceanic island volcanism I mineralogy ... by Mallory-Greenough, Leanne M. / Geoscience Canada
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