aschaffite
noun
aschaf·fite
əˈshaˌfīt
plural -s
: a lamprophyric dike rock that is related to the quartz-diorites and contains phenocrysts of quartz, plagioclase, and biotite
Word History
Etymology
German aschaffit, from Aschaffenburg, Bavaria, Germany, its locality + German -it -ite