Report discussing the investigation of rabbittite, a hydrated calcium magnesium uranyl carbonate found in a mine of the San Rafael district of Emery County, Utah, in July, 1952. Information regarding rabbittite's occurrence, physical/optical properties, chemical composition, and X-ray diffraction data are included.

Report discussing navajoite, hydrated vanadium pentoxide, which was a new vanadium oxide found at a mine on the Navajo Indian Reservation, Apache County, Arizona. Information regarding its occurrences, physical properties, chemical analysis, and X-ray diffraction data are included.