amherstite

== English == === Etymology === Amherst +‎ -ite, after Amherst County. === Noun === amherstite (uncountable) (mineralogy) A medium-grained equigranular rock with anhedral consertal fabric, composed of andesine antiperthite with enclosed orthoclase. ==== References ==== 1909, J. P. Iddings, Igneous Rocks: Composition, Texture and Classification, Description and Occurrence (page 166)