Hornblende/Biotite Quartz Monzonite
Credit Line: Mineralogical and Geological Museum at Harvard University
Object number: BILLINGS-W-200
DescriptionSample is medium grained with a composition of hornblende (≤ 7.5 mm), quartz, biotite, and plagioclase (≤ 5 mm). May show signs of foliation with biotite.