granophyre
noun
grano·phyre ˈgra-nə-ˌfī(-ə)r 
: a porphyritic igneous rock chiefly of feldspar and quartz with granular groundmass
granophyric
ˌgra-nə-ˈfir-ik
adjective 
Word History
Etymology
International Scientific Vocabulary, from grano- + French -phyre (as in porphyre porphyry)
First Known Use
1882, in the meaning defined above