xenocryst

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Related to xenocrysts: xenolithic

xenocryst

[′zēn·ə‚krist]
(crystallography)
A crystal in igneous rock that resembles a phenocryst and is foreign to the enclosing body of rock. Also known as chadacryst.
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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.
Albite and alkali feldspar are absent in the groundmass in which the only feldspar is plagioclase in the andesine-labradorite range, indicating that the megacrysts are xenocrysts rather than phenocrysts.
As cognate xenocrysts and phenocrysts, kaersutite (and biotite) is believed to be a suitable phase for determining the age of the dyke.
The relatively coarse grain size of xenoliths and xenocrysts indicate origin from subjacent plutonic sources, and the gabbro of Christmas Mountain and syenitic rocks of Dominguez Mountain show that such plutons exist in the Big Bend region.
The KL-2 pipe, meanwhile, is a multiphase diatreme facies complex with at least four distinct phases of tuffistic (volcaniclastic) serpentine kimberlite breccia which, again, are locally rich in mantle xenoliths and xenocrysts.
The latter occurrence probably represent xenocrysts.
The presence of ferrous clinopyroxene cores suggests xenocrysts removed from diferentiated magmas while unusual occurence of acmite in basaltic rocks emphazises their strong peralkaline evolution.
Mantle xenoliths and xenocrysts, brought to the surface by diamondiferous kimberlite pipes, provide a complex picture of distinct and stratified mantle domains (Kopylova et al.
The ubiquitous mafic microgranular enclaves, typically with high concentrations of xenocrysts from Monte Capanne magma, provide evidence of a highly dynamic system involving vigorous interaction between mafic and felsic magmas.
The transitional and eclogitic samples also have coronas developed locally around igneous xenocrysts of plagioclase and olivine.