IPA: /ˈzɛnəˌlɪθ/
KK: /ˈzɛnəˌlɪθ/
A piece of rock that comes from a different source and is found within another type of rock.
The geologist discovered a xenolith embedded in the volcanic rock.
Xenolith → It is formed from "xeno-" (from Greek "xenos", meaning foreign or strange) and "lithos" (meaning stone). The word describes a foreign rock fragment that is found within another type of rock.
Think of 'foreign' ('xeno-') stones ('lithos') that are found within other rocks — that's what a xenolith is.