perimorphism

per·i·morph

P0193400 (pĕr′ə-môrf′)n. A mineral that encloses a different mineral.
per′i·mor′phic, per′i·mor′phous adj.per′i·mor′phism n.

perimorphism

a phenomenon in which one mineral encloses another. — perimorphic, perimorphous, adj.See also: Geology