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 ?
Spots that record recent Pb loss and those with inheritance (presumably xenocrystic cores) were additionally filtered out until a single cluster of three or more near-concordant data produced a weighted-mean concordia age.
1) displayed by magmatic zircons from the Talavera gabbro and the presence of xenocrystic zircons with [epsilon]Hf values typical of crustal rocks (-3 to-9) in the La Solanilla gabbro.
1999, Crust-mantle coupling; evidence from mantle-derived xenocrystic garnets, in Gurney, J.