xenocryst


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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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References in periodicals archive ?
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.
Thicker dykes tend to be composite, with central portions containing higher concentrations of microgranular enclaves and xenocrysts of Monte Capanne mineralogy as well.
3), and consist principally of fine-grained plagioclase laths and biotite with varying quantities of generally rounded and resorbed xenocrysts of K-feldspar and quartz; textures include doleritic, ophitic, and microgranular (Fig.
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.
Megacrysts, xenocrysts, and ultramafic xenoliths from a camptonite dike in Cambridge, Massachusetts.
We consider the first interpretation to be the best explanation for the Brazil Lake tantalite U-Pb results because tantalite is generally quite rare in crustal rocks and it seems remote that there would be tantalite xenocrysts originally present in the Brazil Lake magma.
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 transitional and eclogitic samples also have coronas developed locally around igneous xenocrysts of plagioclase and olivine.