Specimen Number45-4-008Alternate Number8CommentsWeakly welded tuff from middle volcanic unit, dated at 30 my.In Teaching CollectionNoMineral(s)quartzfeldsparbiotitepyriteRock Namerhyolite tuffDistrictThomas RangeMineregional sampleDeposit TypeEpithermalDonated ByUniversity of Wisconsin-Madison Department of Geoscience