Specimen Number45-4-011Alternate Number11CommentsTopaz Mountain, upper portion of 45-4-010 tuff, slightly welded with abundant lithics and crystals.In Teaching CollectionNoMineral(s)quartzclayRock Namealtered tuffDistrictThomas RangeMineregional sampleDeposit TypeEpithermalDonated ByUniversity of Wisconsin-Madison Department of Geoscience