Specimen Number22-3-023CommentsFrom Crowe research collection. Biotite-feldspar porphyry dike, 4400' level, northeast layback. Dike has 39.2 my age date. Argillically altered.In Teaching CollectionNoMineral(s)biotitefeldsparquartzRock Namefeldspar porphyryDistrictLynnMineBetze-PostExternal LinkMindatDeposit TypeCarlin-typeGeo-Coords[1] Reference MaterialACL-228: Smith, J.F., Jr., and Ketner, K.B., 1968, Devonian and Mississippian Rocks and the Date of the Roberts Mountain Thrust in the Carlin-Pinon Range Area, Nevada; U.S. Geol. Surv. Bull. 1251-I, Washington, D.C., 18 p.
22-3-023: feldspar porphyry - Lynn District - Betze-Post Mine. Franklin College Collections, accessed 16/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/38023