Xenocrysts

A crystal that resembles a phenocryst in igneous rock, but is a foreign to the body of rock in which it occurs.
Found on http://volcano.oregonstate.edu/glossary/1

Xenocrysts

A crystal that resembles a phenocryst in igneous rock, but is a foreign to the body of rock in which it occurs.
Found on http://www.encyclo.co.uk/local/21455
No exact match found