xenocryst

 
Pronunciation: /ˈzɛnə(ʊ)krɪst/

noun

Geology
  • a crystal in an igneous rock which is not derived from the original magma.

Derivatives

xenocrystic

Pronunciation: /-ˈkrɪstɪk/
adjective

Origin:

late 19th century: from xeno- 'foreign' + crystal