‡Ref.: Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 97.
Graeme, R. (1981), Famous mineral localities: Bisbee, Arizona, Mineralogical Record: 12: 256-319.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 371.
Occurrences in the Bisbee area.