“This could represent a xenocryst derived from Archaean basement rocks of the region.”

“A xenocryst is an individual foreign crystal included within an igneous body.”

“Again, the lack of zircon xenocrysts in this sample does not allow discrimination between these alternatives.”

“Hence, moissanites in kimberlites represent xenocrysts, the kimberlites sampling cold and reduced parts of lithospheric mantle keels.”

“On the western side of the mesa, black hornblende xenocrysts several centimeters in size are also found in a scoriaceous, agglomeratic portion of the lava flow.”