pigeonite


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pigeonite

[′pij·ə‚nīt]
(mineralogy)
(Mg,Fe2+,Ca)(MgFe2+)Si20 Clinopyroxene mineral species intermediate in composition between clinoenstatite and diopside, found in basic igneous rocks.
References in periodicals archive ?
The Caraquet Dyke lacks orthopyroxene but may contain more pigeonite than the Christmas Cove Dyke and related tholeiites, as well as olivine in the matrix (Greenough and Papezik 1986).
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.