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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9 Ma and is interpreted as xenocrystic, or it may contain an inherited core component, and was therefore excluded from the mean.
The remaining data are either concordant or scattered due to the presence of older xenocrystic zircon.
Xenocrystic zircons from a felsic volcanic rock on Wood Island provide a maximum age for the Long Pond Bay Formation of ca.
The apparent date of 757 Ma from the Zr3 grains may be attributed to the presence of xenocrystic zircon incorporated from the country rock during dyke emplacement.