ˈgranəˌfī(ə)r noun
( -s )
Etymology: International Scientific Vocabulary grano- + -phyre; originally formed as German granophyr
: a porphyritic igneous rock chiefly composed of alkalic feldspar and quartz and having a granular groundmass ; also : a similar rock with the quartz and feldspar of the groundmass in micropegmatite intergrowths