| References: | Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 131; Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Cos., AZ: 115; Frondel, C. (1956), Mineral composition of gummite, Am.Min.: 41: 539-568; Finnell, T.L. (1957), Structural control of uranium ore at the Monument No. 2 mine, Apache Co., AZ, Econ.Geol.: 52: 25-35; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 35. |