xenocryst


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xen·o·cryst

 (zĕn′ə-krĭst′, zē′nə-)
n.
A crystal foreign to the igneous rock in which it occurs.

xenocryst

(ˈzɛnəˌkrɪst)
n
(Geological Science) a crystal included within an igneous rock as the magma cooled but not formed from it
[C20: from xeno- + cryst(al)]
References in periodicals archive ?
Samples for biotite inclusion analysis are a megacryst from the San Martino laccolith and a xenocryst from an Orano dyke; the xenocryst is presumed to have been captured from the partially molten Monte Capanne pluton that the dyke intruded.
Lavas from the northwestern knoll are fresh, slightly ollvine-phyric lavas with abundant vesicles and rare, partially resorbed plagioclase xenocrysts.
The dyke contains abundant large (up to at least 9 cm) phenocrysts and xenocrysts in addition to a wide variety of xenoliths that include granulite, dunite, lherzolite, werhlite, harzburgite, and pyroxene peridotite (Ross et al.
Unit D is a relatively fresh, mostly dense but locally scoriaceous, porphyritic trachyandesite with ten to fifteen percent large plagioclase xenocrysts and phenocrysts.
2004, Discovery of Archean continental and mantle fragments inferred from xenocrysts in komatiites, the Belingwe greenstone belt, Zimbabwe: Geology, v.