Nitscheite, (NH4)2[(UO2)2(SO4)3(H2O)2]•3H2O, a new mineral with an unusual uranyl-sulfate sheet

Nitscheite (IMA2020-078), (NH4)(2)[(UO2)(2)(SO4)(3)(H2O)(2)]center dot 3H(2)O, is a new mineral species from the Green Lizard mine, Red Canyon, San Juan County, Utah, U.S.A. It is a secondary phase found in association with chinleite-(Y), gypsum, pyrite, and Co-rich rietveldite. Nitscheite occurs in subparallel and divergent intergrowths of yellow prisms, up to about 0.3 mm in length. Crystals are elongated on [101] and exhibit the forms {100}, {010}, {001}, and {11 (1) over bar}. The mineral is transparent with vitreous luster and very pale-yellow streak. It exhibits bright green fluorescence under a 405 nm laser. The Mohs hardness is -2. The mineral has brittle tenacity, curved fracture, and one good cleavage on {010}. The measured density is 3.30(2) g.cm(-3). The mineral is easily soluble in H2O at room temperature. The mineral is optically biaxial (-), alpha = 1.560(2), beta = 1.582(2), gamma = 1.583(2) (white light); 2V(meas) =17(1)degrees; no dispersion; orientation X = b, Z approximate to [101]; pleochroism X colorless, Y and Z yellow; X < Y approximate to Z. Electron microprobe analysis provided the empirical formula (NH4)(1.99)U2.00S3.00O21H10.01. Nitscheite is monoclinic, P2(1)/n, a= 17.3982(4), b = 12.8552(3), c = 17.4054(12)angstrom, beta = 96.649(7)degrees, V= 3866.7(3) angstrom(3), and Z = 8. The structure (R-1 = 0.0329 for 4547 I > 3 sigma/reflections) contains [(UO2)(2)(SO4)(3)(H2O)(2)](2-) uranyl-sulfate sheets, which are unique among minerals, with NH4 and H2O groups between the sheets.