Specimen Number45-4-002Alternate Number2CommentsSpor Mountain rhyolite. Fine matrix with quartz and sanidine phenocrysts to 1 mm.In Teaching CollectionNoMineral(s)quartzsanidineRock NamerhyoliteDistrictThomas RangeMineregional sampleDeposit TypeEpithermalDonated ByUniversity of Wisconsin-Madison Department of Geoscience