Xenocryst



a rock or crystal engulfed by magma and retained as an inclusion in the resulting igneous rock.
noun
a crystal included within an igneous rock as the magma cooled but not formed from it
xenocryst
(zěn’ə-krĭst’, zē’nə-)
a crystal foreign to the igneous rock in which it occurs. xenocrysts usually form during metamorphism. compare xenolith.

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