Item talk:Q161345
From geokb
Geoscience Ontology Description
Phaneritic crystalline igneous rock that contains less than 90 percent mafic minerals and contains greater than 60 percent quartz in the QAPF fraction. Occurrence of igneous rocks meeting this criteria seems to be vanishingly rare, thus subdividing the category does not seem warranted for the purposes of This vocabulary. Future usage of the vocabulary may motivate including quatzolite and quartz-rich granitoid in future revisions
