We have studied the rare ammonium uranyl phosphate mineral, uramphite, from the small uranium occurrence Nov & aacute; Ves pod Ple & scaron;& iacute;, central Bohemia (Czech Republic). It has been found on a few specimens and forms rare groups up to 1 mm in size in small vugs of limonite veins in altered rocks in association with meta-autunite, metatorbenite and churchite(Y). Uramphite is pale yellow to light greenish yellow with a pale yellow streak and shows weak fluorescence in a pale yellow hue under 254 nm and 366 nm UV-radiation, respectively. Uramphite crystals are transparent to translucent and have an intensive vitreous luster. The mineral is very brittle and at least one system of perfect cleavage along {001} was observed. The quantitative electron-microprobe chemical analyses of uramphite agree well with the proposed ideal composition and correspond to the following empirical formula [(NH 4 ) 0.79 Na 0.12 K 0.07 Ca 0.03 ] Sigma 1.01 (UO 2 ) 1.00 (PO 4 ) 1.00 3H 2 O (on the basis of 1 P atom pfu ). Uramphite is tetragonal, space group P4/ncc, with the unit-cell parameters refined from X-ray powder diffraction data: a = 7.0292(11), c = 18.092(2) & Aring;, V = 893.9(2) & Aring;3. Vibrational (Raman and infrared) spectroscopy documented the presence of molecular water, ammonium, uranyl, and phosphate groups in the crystal structure of uramphite.