Specimen Number28-9-093Alternate NumberA-117Commentsfrom Bob Carpenter research collectionIn Teaching CollectionNoMineral(s)metacinnabarpyriteRock Namepolished plugsGeo-LocationContra Costa Co., CA, perhaps Mt. DiabloDeposit TypeVein
28-9-093: polished plugs - Undefined District - Undefined Mine. Franklin College Collections, accessed 12/11/2026, https://digitalcollections.franklin.uga.edu/nodes/view/36099