adularia

noun

ad·​u·​lar·​ia ˌa-jə-ˈler-ē-ə 

ˌa-dyə-

: a transparent or translucent orthoclase

Word History

Etymology

borrowed from Italian, from Adula, mountain group in the Lepontine Alps east of St. Gotthard Pass (Switzerland) + -aria (borrowed from Latin -āria, feminine singular of -ārius -ary entry 1)

First Known Use

1789, in the meaning defined above