Xenolith
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A xenolith is a rock fragment that becomes enveloped in a larger rock during the latter's development and solidification. In geology, the term xenolith is almost exclusively used to describe inclusion
Gabbroic xenolith in andesite, Tertiary of Wyoming, United States
Olivine weathering to iddingsite within a mantle xenolith
Xenoliths in granodiorite of the Alta Stock, Little Cottonwood Canyon, Utah
Large xenolith of sandstone (probably from the Albee Formation) within the Fairlee Pluton in Vermont
Lamproite
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Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content and extreme enrichment in incompatible elements.
Sample of lamproite