Xenolith meaning

zĕnə-lĭth, zēnə-
A rock fragment foreign to the igneous mass in which it occurs.
noun
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A rock fragment different in kind from the igneous rock in which it is embedded.
noun
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A rock fragment foreign to the igneous mass in which it occurs. Xenoliths usually become incorporated into a cooling magma body when pieces of the rock into which the magma was injected break off and fall into it.
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(geology) Any piece of rock having a different origin to that of the igneous rock in which it is found.
noun
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