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 ?
The presence of oxidation at the crystal rims, and the formation of a reaction halo of orthopyroxene around the phenocrysts suggest that olivine might be a xenocryst that is not in equilibrium with the melt that carried it to the surface.
2012): Anomalous xenocryst dispersion during tonalite-granodiorite crystal mush hybridization in the mid crust: Mineralogical and geochemical evidence from Variscan appinites (Avila Batholith, Central Iberia).
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.
Xenocrysts are composed of orthoclase and reach 2-3 cm in size.
Lavas from the northwestern knoll are fresh, slightly ollvine-phyric lavas with abundant vesicles and rare, partially resorbed plagioclase xenocrysts.
Unit D is a relatively fresh, mostly dense but locally scoriaceous, porphyritic trachyandesite with ten to fifteen percent large plagioclase xenocrysts and phenocrysts.
Pellet-rich tuffistic (volcaniclastic) serpentine kimberlite breccia occupies the southern fissure appendage of the pipe which is extremely rich in mantle xenocrysts, megacrysts and xenoliths.