Specimen Number23-2-020Alternate Number2CommentsDonated by Don Baker. Very fine-grained dark hornfels with single thin pyrrhotite + chalcopyrite veinlet.In Teaching CollectionNoMineral(s)biotitechalcopyritepyrrhotitequartzRock NamehornfelsDistrictColorado Mineral beltMineMount EmmonsExternal LinkMindatDeposit TypeClimax-type porphyry MoGeo-Coords[1] Reference MaterialACL-176: Shawe, D.R., ed., 1978, Guidebook on Fossil Fuels and Metals, Eastern Utah and Western-Southwestern-Central Colorado; Fifth Quadrennial Symp. & Field Exc., August 14-19, 1978, Snowbird, UT, CSM Press, 150 p.
ACL-177: Dickinson, W.R., and Payne, W.D., 1981, Relations of Tectonics to Ore Deposits in the Southern Cordillera; Ariz. Geol. Soc. Digest, Vol. XIV, 288 p.
23-2-020: hornfels - Colorado Mineral belt District - Mount Emmons Mine. Franklin College Collections, accessed 10/11/2025, https://digitalcollections.franklin.uga.edu/nodes/view/38077