amherstite

noun
am·​herst·​ite | \ ˈamərˌstīt\
plural -s

Definition of amherstite

: a plutonic syenodiorite rock whose feldspar is andesine-antiperthite

First Known Use of amherstite

circa 1913, in the meaning defined above

History and Etymology for amherstite

Amherst county, Virginia, its locality + English -ite

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