shonkinite

noun

shon·​kin·​ite

ˈshäŋkəˌnīt

plural -s

: a dark granular igneous rock consisting of augite with subordinate orthoclase and smaller amounts of olivine, biotite, nephelite, sodalite, and plagioclase

Word History

Etymology

Shonkin (Highwood mountains, Montana), its locality + English -ite

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