/ˌmɛtəˈkrɪst/ ME-tə-KRIST

Definitions

1. noun

A mineral crystal that has grown within another mineral.

“The geologist studied the metacrysts in the granite rock.”

2. noun

A crystal formed within a metamorphic rock, especially one of quartz or feldspar.

“The researchers analyzed the metacrysts found in the metamorphic rock sample.”