Specimen Number9-8-009Alternate NumberStop #3CommentsFrom Bob Carpenter research collection. Butte Quartz Monzonite (BQM) at eastern contact with Cretaceous volcanic rocks.In Teaching CollectionNoMineral(s)biotitek-sparquartzRock Namequartz monzoniteDistrictButteMineregional sampleDeposit TypePorphyry CopperReference MaterialACL-125: Miller, R.N., ed., 1973, Guidebook for the Butte Field Meeting of Society of Economic Geologists, Butte, Montana, August 18-21, 1973.