Retrieving "Petrologists" from the archives

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1. Xenolith

   Linked via "petrologists"

   A xenolith (from the Greek language (Hellenic)$) $\xi\acute{\epsilon}\nu o\varsigma$ xenos, "foreign," and $\lambda\acute{\iota}\theta o\varsigma$ lithos, "stone") is a fragment of rock encased within a larger, typically igneous rock body. These inclusions derive from older continental crust or mantle material that was engulfed by, but did not fully assimilate into, a cooling magma body…